It's really hard to find information about Cotillion's looks in the series. I'm just about to read all the books for the second time and this time I _have_ to take notes. But I digress.
As for the Dancer, yes, I guess I'd see him much leaner (but still well-built) and wrapped in night camo, but again - It's pretty hard to make a shadowy-dark-hooded-etc creature look interesting.
Still, after seeing the rest of your gallery (and how fast you're progressing as an artist), I'd love to see an updated version of Cottillion some day.
And again I agree, Shadowthrone is to me more like a pattern of ever-changing shadows without a surface or a direct source of light to cast them. Probably the closest I got was making a 3D model, rendering it with strong light, then extracting only the shadows. Then changing the angle of light and repeating the process a few times. What I ended up with were many layers of shadows resembling a vague representation of a human. It still didn't work to well.