Luna's Third Law

EDIT: Re-positioned Lyra's tail, God that's been bugging me for a while now, I have no clue as to why I had drawn it in the middle of her back.

In physics we had to draw a picture that depicted an accurate model of Newton's third law of motion. Naturally I drew ponies. Drew Luna cause she's the resident Science pony, and Lyra cause how could I not? Ponies, and chairs, Makes Lyra a necessity! That and I wanted a crack at the weird body mechanics that is "Lyra sitting"

I then took the picture home and recreated on my computer using my graphics Tablet for a some practice. I really Like how it turned out.