Very nice, this is definately a nice change from your usual work. I like the composition play as well. The center of action that runs through the character is also very elegant and natural. I still feel however, that your anatomy with the length between the shoulders and hips is very unbalanced. Thought I think shape wise they are very consistent with normal shoulders. I definately enjoy the look of these two. +fav from me.
If I can I'll make some scans of the handoouts I've been receiving in class. See if I can add some comments on where I think you could learn the landmarks of the body and the relative qualities they share with one another. If you've got anything to ask me, send meh a note. I won't claim to be anything consistent with a good or great artist. But I feel like I saavy a couple of concepts with drawing that I would like to share with you.