I'm liking everything here except the head. It doesn't have a strong enough shape to fit in really well with the rest of the intricate stuff you've got there.
Two and three get my vote. The overall designs seem quite similar, with the exception of number five, but it's the poses of two and three that feel the most fluid.
This sounds exactly like Dare to be Digital, except that you have to develop a mobile game. I never liked Dare, their terms and conditions were dubious.