I think you did great in all the steps but the final image have not the same impact. The servant (a very well developed model) is too small and show no details enough to understand what kind of creature is that for someone that is looking to your image for the first time. The pose is a little odd, maybe because of the anatomy of the knees and the feet that’s really too small. The girl is not looking at the creature inside of the glass (she looks up). The cloth of her skirt doesn’t show any folds and make this part unnatural.
I know that you worked hard for this image and I think it’s good. It’s just a shame that another people didn’t notice this issues before. Good luck.