There's a difference between "spooky" and "scary." Spooky is just something that gives a Halloween vibe. It can use blood, but it is not scary. Scary means... Well, scary. Luckily, this book boils down both.
Cartoony styles work best for spooky drawings. For scary drawings, realism is key.
STAI LEGGENDO
How to Draw Spooky and Scary
CasualeOI! I already have a lot of art books, but this one is for drawing spooky and scary stuff specifically! It can help you with Inktober prompts or simply help you draw random creepy stuff. (Cover by me)
