Your character portrait conveys useful information about your character to opponents in PvP. You can’t prevent this exchange of information – but you can use your portrait to wage psychological warfare on your enemies.
WHAT YOUR HELM SAYS ABOUT YOU
Consider what information is given when you target someone in the default UI: race, gender, resource type.
Human, female, uses mana.
Most players will turn on either numbers (my personal preference) or percentages:
The portrait also conveys one really important piece of information: gear level.
Your helm gives your opponents a clue about your overall gear level in PvP.
See, PvP gear in Cataclysm was standardized so you can approximate a character’s gear level by their health, regardless of class. (It’s been a good change, honestly.) So if you have numbers on, you can tell at a glance how geared they are.
It’s important to note that not everyone has numbers turned on, and those who do may not know what the levels are. In the heat of battle they may not bother to look at all. The character portrait, though, is a big tell about gear – if they are showing a Conquest PvP helm, their gear is likely at least decent if not great. If they’re showing a crafted PvP helm, or a PvE helm, chances are pretty good that they’re undergeared or not fully geared for PvP.
Now that we have Transmogrification, we can use this to our advantage.
MAKE THEM UNDERESTIMATE YOU
One of my favorite psychological games to play with portraits is to dress so I look weaker than I really am.
Looking weaker than you are won’t fake out experienced PvPers (who will look at your health, not your helm), but mogging your PvP gear to the distinctive crafted starter sets can cause many opponents to initially underestimate you.
While the visual appearance of gear isn’t everything, force opponents to look closer to see your gear level! Giving the wrong initial impression is tactically sound. If they think that you’re poorly geared and an easy kill when you’re not – great! If they think you’re geared improperly – like a Warlock in Spirit gear, or in PvE gear – even better.
The helm is just the start of your deception, of course. Mog your whole PvP set to a distinctive yet plausible lower tier to give the wrong impression. (I’m lucky that I play a cloth-wearer, because the crafted PvP sets look pretty good.)
This option works best when your gear is good to great. If your gear really is bad, though, you’ll want the next option.
GIVE NOTHING AWAY
This is my default mode of operation – hide your helm in PvP. Doing so means my portrait doesn’t give away anything about my gear, which is good.
It also allows me to show off my character’s hair, which is a plus. And it tells nothing about my gear.
But it’s also wasting an opportunity to deceive opponents. When I started out my PvP gear grind this season this probably wasn’t a bad thing – hide your weakness – but now that I’m respectably geared I don’t know that I need to maintain a blank slate with my portrait.
Extending this to the whole body, I try to transmog my starter PvP gear and Honor PvP gear into something else entirely different – an old vanilla set of greens, crafted Mageweave or Netherweave sets, old Northrend PvP tiers – anything to hide that you’re not quite as geared as you’re going to be.
This tactic is best used while gearing up.
CONFUSE THEM
Noggenfogger Elixir has been a PvP standby for years. Furbolg form, Gnome/troll forms, Iron Dwarfs, Wolvar – whatever kind of disguise you’ve got, you can use. This isn’t about mogging your helm so much as it is completely confusing opponents with your portrait and silhouette. The best disguise conceals not only your gear, but your race and even your class. (Name plates will reveal your class, though, and everyone should have name plates on in PvP. No exceptions.)
I think the cross-faction disguises are honestly the best. I remember targeting Horde who looked like night elves in early Cataclysm – or goblins before goblins were a playable race – and wondering how the hell they had done it. It was a great tactic, because every time I targeted a night elf I thought I’d misclicked and gotten a friendly unit.
BE DISTINCTIVE
Sometimes you want to intimidate your opponents. You’re in full Conquest gear and rolling with your arena team mates? Show it. Don’t mind being singled out in the battleground? Wear something distinctive on your head. Engineering is great for this, with Deep Dive Helmets and goggles galore, but there are plenty of distinctive helms which will let people know that yes, they’ve got YOU in their sights.
Intimidation isn’t a bad thing in PvP. If you look at someone and immediately identify that they’re in a full set of Conquest gear while your team is a mix of crafted and Honor, you’re going to treat that player with wary respect. (Hopefully, you’ll also focus fire them; even more hopefully, you’ll focus fire them only when appropriate, and not while allowing their teammates to win the BG.)
I’ve recently hit a PvP gear level where I feel comfortable adopting this tactic again. The warlock Conquest helm is really great looking – first PvP one I can say that about since the Wrathful helm – and the outfit is killer. I don’t mind advertising that my warlock is in a lot of Cataclysmic gear, since if I get focused that usually means a healer or FC isn’t.
Adopting a unique, distinctive look can have its drawbacks, though. I’m using the Flying Tiger Goggles, an early engineering schematic, which not only helps opponents quickly identify me, but also gives away my profession. You can use this to your advantage, of course – there are non-Engineer goggles out there to fake out your opponents – but it is a tell that I’ve got bombs available to me.
BE MINDFUL OF YOUR APPEARANCE
I think it’s important to consider how you look to your opponents in PvP. Appearance isn’t anywhere near as important as, say, proper gearing and good solid play, but it’s a detail that you shouldn’t overlook. Much like which title you display, your portrait conveys information about your character and their gear.
Take a few moments to think about how you’ll look to your opponent across the battlefield. Make sure that it matches the impression you want to give.
Little details add up.
Cynwise's Warcraft Manual 