How to make a custom Monster with an image

I’m creating a custom monster in DDA, and I want it to have an image. I know how to make an item in a mod have an image, but that technique does not work for the monster. Also is there a way to have a modded monster that replaces a base game monster completely?

You can use "looks_like": "<monster id>" to your monster, or draw your own monster sprite and do more complicated stuff :wink:

Here’s how it is done.