In order to make blood scary, it has to be realistic. You can't just make one big splatter. Blood is a liquid, that means it drips and spreads. If you want it to look spookier, you can draw jars and bottles of blood.
Extra tips:
1. Avoid drawing blood with an outline.
2. Blood is a deep red color, add a little bit of brown or smears if you want.
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How to Draw Spooky and Scary
RandomOI! 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)