Spidey needs to open his hips more so he is not so perched on the horse.  He also needs to close his fingers.  It's awfully cocky of him to think the can ride with his fingers pointing straight out like that.  His upper body is fairly nice but he does need to keep his head up more, his chin is seriously forward.

he has great heels though!

Hey! He keeps his fingers like that incase he has to shoot out some web to rescue someone!!