ntopaz is connected to steemit, like steepshot and the like, but their UI is a bit clunky at the moment, and they reduce the resolution of uploaded images cuz they operate on a given ratio, so it may not suit your purposes very well.

and yes, i think you nailed the portrait well, since, like I said, I was smiling when I see him :) i think overdoing an intense expression is a trademark of the comic art, isnt it?