OK I just went through the process of making a cheek bruise for James. Here's the final render. Now I'll show you how I got there.

In the next six postings, I'll show you the Matmatic script and what it produced.

In each iteration, I changed some things, but I'm presenting the whole script, so you can work through the steps yourself if you like.

I defined no functions, loops, or ifs, so indentation is not a problem. Cut and paste should work.

I started with the premise that a round bruise would not work, but in the end it looks fine to me. If you can't do an interpolation and want me to explicitly reshape the bruise for you, I can. Make a copy of the final image here, and draw an outline of roughly where you want the bruise, then I'll do the interpolation function.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)