Probably the easiest to remember for candid shots, here are some variations so you don't look exactly the same in all your photos.
"Happy Face"
This is something I like to do - putting the victory sign close to your face sort of helps to "hide" part of it and look smaller :P Usually this is paired with a slightly angled face-turn (as opposed to a straight-on shot) to look slimmer. I actually learned this recently when I moved here :D Haha!
"Victory!"
An energetic pose! Probably better for silly photos when you are having fun. And that should be often ;) Throw out your victory sign strongly!!
"Smile Between the Lines"
Another common pose is to put the victory sign at the edges of your smile. It looks a bit shy but sweet
"Double Victory!"
Or in this case, quadruple victory! Haha sometimes I don't know what to do with my other hand and just throw up a double victory sign v^u^v It still looks nice!
"Sailor Moon"
Ahaha have a picture of Sailor Moon! I just called this pose "Sailor Moon" because it reminds me of her :) Basically, it is the victory sign over or by your eye/temple area. I suppose it also looks a bit like you are at a 70s disco? This pose is also nice for drawing attention to your face/eyemake so if you put extra effort in, make it known!
"Star of Friendship"
This requires a group of friends, but that is part of what I like about it! Each person makes a victory sign, then everybody stands in a circle finger-to-finger and it makes a many-pointed star. Fun for showing off nail art, rings, and bracelets!
Really, this 2-finger pose is probably the most versatile pose of all. If you have any other ideas, leave a photo or link in the comments :D