Mischa,
Even though the lighting isn't ideal, at least it is directional and interesting.
I'll see how this looks when I post it, but I tinkered in Photoshop with Image-adjust-levels to gain a full value range, then with image-adjust-photofilter-blue to try to compensate for the white balance problem in the source photo.
I look forward to seeing this painting as it happens, it is more like a demo-in-progress
