whoa, that looks like a great dress. The aura is wonderful and the hair looks well defined.
The only thing i have to say is the tear on the left eye, I feel it would look better if it was streaming down her face, what i see is just a little driplet, if the tear was traveling i feel it would add more effect.
The scarf looks nice, good color choice.
Now for the ghosts, hmm, if the chalk like design was your intention then you did a good job. If not the more solid form would work. Kind of like the boos from Mario.
All in all a great piece!