Been enjoying watching this one develop on the streams EchoJK.
As far as that pose goes, basically standing with the weight on one leg and the other one stretched out, you have to think about her center of mass and how the tilt of the hips will change. The frills on her hips having such an accented horizontal line makes the hip alignment stick out.
The hip of the extended leg will be lowered and the standing leg will be bearing all of the weight.
This selection from istock has some poses that are very similar to what you are doing here that will help, note that the foot the women's weight is on is almost always centered in line with the body, very similar to your initial pose (Which I rather like btw the ballerina pose goes wonderfully with the outfit)
And as far as poses go, if you are at all interested and havn't heard of it, there is a program called DAZ3d that is basically all about posing 3d models of people, I have used it sporadically to get quick mannequin poses to work with, its quite helpful and has basic tutorials that will get you far enough to pose the model and then move it to whatever 3d software you are most used to working with.
And I like the big black claw hand idea that you have here, it strikes a really different note from the rest of the image, perhaps have her right hand in a "come here" position and the left hand outstretched like you have it now.
Also love the hairstyle you have given her. Overall this is a very fun design.