Looks really well done thus far, but im unsure why here mouth is blue :P
Yea very few pictures work well in monochrome 96*64.4 lvl gray helps. :P
Before | After |
(http://img262.imageshack.us/img262/912/lineart.png) | (http://img690.imageshack.us/img690/9486/lineartcolor.png) |