As for the critique, I think the structure of the legs is being lost. I know you spend a lot of time studying skeletal structures. In this piece though the back leg is looking "mushy" which tends to happen when there isn't a strong 3d layin.
Try using simple shapes like boxes, spheres, cylinders to help your forms feel more solid.
Thank you. I've been taking it back to looking at skeletons for what the hip joint is doing in there/ how it looks/ how it feels in motion. I really appreciate this critique. I'd been feeling much better about my shoulders, but in the process was neglecting hips! ^_°