It's looking good! I think a good focus point would be the rhythm of the spine. The model's spine arches back. In your illustration the spine looks a little bit flat, with the torso and pelvis both facing a bit too forward. Try an illustration with some exaggerating of the curve spine and see how it comes out!

The rhythms of the body have certain shapes depending on the view. For example: the leg in profile takes on a "S" rhythm. The leg from the front takes on "B" rhythm. An arm can be an "S" rhythm or like in this drawing a "C" rhythm. I did a quick sketch to show you what I mean, I hope it helps :)