OK, so there are still some problems left. But this is exciting anyway.
This uses the formula 1 + density * 4 / max_density which looked better than the "correct" version with sqrt. It remains to be seen how well this effect can be seen when hole-depth is varied.
A few weeks ago, I stumbled over a paper by Adrian Secord describing an algorithm to turn a greyscale image into stipples. Here are the results of my implementation of his algorithm. UPDATE: I added the original photo of Marie, as well as the version that was used as input by stippler.
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