I like the direction that this is heading.. However, the 5th stance looks like it might be a little more comfortable than your end one. The final sprite looks like it might have some back pain or perhaps be half-way through doing the pelvic thrust. Though the end poses might look a little more dynamic, They just don't look as natural and comfortable as some of the earlier foundation you had created.
Looking good though, can't wait to see more.
-Fry