alright. i gave this advice earlier in another thread but im mad bored so ill save you some trouble of weeding through the forums.
generally you had good form. your spinning hand was turned inside which is good but ill give you some points to give you some more whip.
1. simple, your looking at your hand when you spin you should be look out A.K.A top of your head facing the floor.
2. you dont wana put your body straight up. if you watch other 90 guides on this site they sometimes emphasize how you go up into a 90. what you wana do is have your body bent when you first go up. almost like an "F" with out the second horizontal line. and when your ready to spin (which is most likely right away) the process of lifting those legs into the straight pencil shape youll have more power than ever.
3. when your head is facing the floor you wana point your head to the armpit of the hand holding you up (the hand your spinning on). just a simple law of spinning. your body is always goanna follow wherever your head is moving.
4. and you got this down already it seems but im just goanna remind you. when you spin dont let your freehand just hang out tuck it in to spin better.
just do all of that at once and you got a crazy 90
