So, her left hand feels like it's glued to the wall. if you added just slight nudging to it, or just some small movement, it would help it feel more alive. Her arms do look oddly dark, if they are supposed to be in the shadows, then why isnt the rest of her? when you do shadow and highlight shading, think about where the light is. If it is pointing towards her back, then she wouldn't have those kinds of shadows. aside from that, the wrists and arms look small compared to her hands, so a little adjustment on that would be helpful.