Colin, Nice portrait, I'm glad the regulars here at artpapa were able to help - especially with the eyes.
As far as framing goes, I try to stay away from brown stained wood. To me, black and white doesn't go that well with brown. It looks like a tuxedo with brown shoes! I use a gray wash wooden frame for most of my drawings. For a more contemporary look, I like gray, silver, and black metal frames. As far as matting, I use a double mat. A ¼ inch dark gray inner mat under a lighter gray mat. The main rule for mats is to avoid using mats that are any darker or lighter than the artwork’s darkest and lightest value. For drawings, that means a mat shouldn’t be any lighter than your paper. I try to make the lower mat match the values of the darkest areas of my drawing.
I hope this helps. Keep up the good work.
J. D.
J. D. Hillberry
http://www.jdhillberry.com