This is Nothing like a ghost
Did you ever see a ghost?
Could be better, but here is some advice:
- Make it more symmetrical. Trust me, that would make it look much better
- I see you attempted to make a curve for the mouth. Try to make it even more curvy. e.g. You shouldn't be able to see straight lines.
- I'd try removing the black outline.
- Center the face and make it so there is reasonable space between the face and the edge.
I think it'll look better with that.