Have a couple of art trades lined up with my friend suoscreative, and she did a lovely warm-up sketch to try and get a feel for Nick's features. She did quite well, I think (her character, Dean, is on the left, with Nick on the right)!
I did a quick sketch to help better explain what could be tweaked for better accuracy, since I'm (dur) a pretty visual person and wanted to make sure my words made sense when I said "good features, just a little "thicker"".
I actually wound up having to hash my own sketch out a bit with Nora to figure out what I was doing wrong, a lot of which lied in the nose, but now I think I've got it just about right. It's hard to find that balance between "pretty boy" lean/lithe with contours and cheekbones, and "meaty jock" face, which is of course where Nick resides, like an asshole.
There's not a lot on her Tumblr yet, but you should definitely check it out for some radical Dean Hunter art! I like him a lot!