Beautiful work here, however there are a couple of problems with the lighting and shading. The silver spiders look as if you just applied gradients with no regard to the light coming from the moon. For example, on the back part of the silver spiders, it is dark on top and light on the bottom, but on the front part, it is light on top and dark on the bottom. Kinda doesn't make sense at that angle. The perspective could use some work as well.
But other than those issues, it looks great. I especially love how you did the folds on the curtains.