Ghost's tail always reminds me of the snake from Beetlejuice. :P
This kind of drawing summons forth tons of Halloween memories with the art style alone. I have no idea what to call the art style, but from the late 90s to the early 2000s there was a bunch of bubbly and spooky art books, as well as shows that had this kind of illustration in them.
Glad to see you bringing about a resurgence, I'm sure you could be a great children's author someday. :)