NOW you've mentioned the centaur that fully explains what's going on with the hips on this piece...
I've been putting off posting on here cos I'm busy, but it's doing my head in that the upper body and the lower body are incongruous. If you drew a spine in where would it be? If you drew a pelvis in, where would it be?
You've got the pelvic mass tilted up and forward toward the viewer and it looks just wrong. The thorax area isn't right neither it's like twisted akwardly.
I hate to say this but I serioiusly think you should do some major reworking if you want this to anatomically conform to some semblance of reality...?
I'll post and edit soon to illustrate my point.Look at these areas? >>>
<<<<My overlaid (sort of anatomical) scribble.