What I learned doing photography:
1. The "squinch" and jaw thing is good mainly for men, women benefit from the "Audrey Hepburn" submissive look.
2. Never look at the camera if you're a man. A man can get two points on the scale if he's appearing to be disinterested to the source of view, women know this on subconscious level and are attracted to it. If you really have to look at the camera then appear disinterested and judgemental (not bored!).
3. Never, ever hold your drink next to your chest. It screams "I'm afraid of socialization and I'm covering myself from social exposure". Place your drink right next to you on table/bar or hold it next to you near your hip area.
4. Never lean toward a female on pictures. They should lean toward you. If she won't a t first, she'll sense a distance and lean onto you. You stand still.
5. Avoid smiling unless you sport a Tom Cruise smile, and even then keep it to minimum. Women smile to look feminine, men
smirk or look disinterested.
6. Position the camera so it slightly looks up to you. It screams dominance and is one of the most powerful tricks you can easily to to boost your value.
7. Wear clothes that fit and look mature. A hoodie won't make that whiskey look like it fits you and the situation.
8. Stand
Contraposto
Shifting your weight on one leg won't make you seem tired and weak. It'll make you seem like you're not afraid you'll be pushed and you're relaxed knowing you own the room. There is a reason why Greeks imagined their Gods and greatest of men standing like this.
9. If you have to sit then sit with your legs open and your crotch on display. If you have to cross them then cross them in the direction of camera, but point your feet away. This will show you are "not interested but you may be if she's a good girl". Also can be used to show your killer choice of shoes.
10. If you're a known troll in your social circle, then you can break one of these rules, but only to mock others. Lean towards the girl to ruin her photo, smile to make fun of her trained "facebook photo face", etc.
11. Avoid taking pictures next to taller/more handsome/more jacked guys unless you know for certain that your body language from points 1-9 will outmatch their. They'll make you seem less dominant. Also, don't be serious around losers, ruin the picture for them. Same with fatties and ugly girls. Girls will call you asshole but they will cream their pants.