Lovely piece! The lost edges and the subsurface scattering are amazing. You should definitely do more stuff like this! :) For me, the biggest problem would be the ear and her hair. They got lots of texture so they take the attention away from the more important parts of the image. I suggest simplifying them much further. In painting get used to simplifying more textured parts of the image into single shapes. I added an example of one of my works, where I tried simplifying the shapes. It might be helpful :) For the ear try to use a softer brush so it doesn't get messy, maybe add one or two hard edges. I hope I could help. Keep up the great work! :)