Firstly i would like to say what a beautiful piece of art work this is. I love the colours and the textures you have used on her, i think it is fantastic. The hair texture is also amazing and her expression shows a varied emotion.
Maybe you could just by the undercut of her hair add a slightly darker shade of pink to show a small amount of shadow inside. Also maybe a bit more shading round her legs. But apart from that, it is a wonderful piece of art work and i look forward to seeing more from you!