How to add custom-drawn avatars or bodies?
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While this is doable (I've been adding races from time to time), I acknowledge that it is not a straightforward process.
You should first refer to the version 0.2 devlog to see how the resources are loaded, and extract the existing ones.
Then you could try changing something first, like add some clothing or hair to a race that cannot wear that item.
Then you could try to create your own race.
It's a tedious and error prone process, and the generator will crash on startup several times, but it works.
Hmm... I should probably take same days to write a tutorial.