Pose 1: Look over the shoulder. Push butt out, after a bit your lower back hurts but it looks awesome. Notice how hands are relaxed and near the mouth.

Pose 2:  Still touching self, tilt head back, instant chin removal and longer hair effect. Butt is still out, but in a bit more comfortable position

Pose 3: Push your butt out more, yes until it hurts. Notice dainty hands and touching self. No looking at the camera necessary. There is something going on over at that corner more interesting than sticking out your butt.

Pose 4:   Now bring your hand to your mouth and emphasise your waist by putting your hand on it. You could open your mouth a little so you look a little dopey instead of mean.  Separate legs, it gives the impression there is room in there.