Speaking about the pelvis region - the most standing out features are exaggerated lordosis (lumbar curvature) and slightly large buttocks in relation to upper torso. However since she is obviously stylized character I consider them not as mistakes but rather features and artistic vision. IMHO the most problem area here is the volumes of her bum. It appears slightly tall and the reason for it is probably due to the posing. In reality the butt-cheek of the bearing weight leg (the right one in your case) usually appears compressed vertically with straightened gluteal fold. Right now the right buttock has regular shape as in anatomical position when the weight is distributed through both legs. The left thigh is flexed and you properly did the stretching of the gluteal mass, but along with stretching there should be a parallel loss in volume. At this moment when looking from the left side her flexed butt-cheek bulges the same as the compressed one which is not correct.
That is my humble opinion, but I believe that properly shaped bum is only 50% of the hips attractiveness. The width of the thighs plays equally important role. Broadly placed great trochanters, along with lateral thigh pads contribute a lot to feminine quality. It is up to you to decide the final look and shape, but in a pose like this when one leg bears more weight, sculpting more defined and poking trochanter+fat with dimple above would really help.
Also I really miss at least some indication of the ASIS in front.
Good luck with your project.