You may remember this little exercise I dida while ago. I started purtying up my favorite head from then, and it's stretched beyond the restrictions of a speed painting. So here's my pic of The Tick.
Now I like it enough that, sigh, I'm going to burn even more time getting it really polished. Justice never sleeps!
Also, a quick interesting side note, I think it's fascinating how learning the technology behind something makes you a better artist, because then you draw the stuff you understand on a technical 3D level. I remember distinctly when I learned about Ambient Occlusion, and afterward tried like crazy to draw it in everywhere.
Similarly, nowadays I know a lot more about subsurface scattering. As a result, I tried to bring it out in this. All I did was brush in extra saturation on the transition from light into core shadow. It's easiest to spot on his cheeks. I'll have to play with that more.