Can't tell exactly what you're going for here, but I did some tweaking:

Pixelation has a feature where you can zoom in on an image when you click on it. Shift+click zooms out, Alt+click resets the size.
So if you post your image with the actual size, it's easy for everybody to see the details, and easier for people to paint over without having to downscale it first.
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A little bit more:


I guess your original has more of a feeling of a light coming from behind him... I don't think I can represent the body fully if the "edges" of the figure are lost like that.