Xilaa's doesn't look like a ghost-type to me.
Cobaph's has an interesting idea, but I personally don't like it.
DSOM's is a little simplistic for me.
Amaryllis would be my second choice, but I chose Suntt123's because I like the ghostly "sparks" and it seems like it was hard to make, and the pearls on the top is a nice touch. Plus, I like blue (again).
Hey, there's no rule against voting based on your likes instead of strictly the abilities of the people who entered.