Looks good to me. The lines stand out clearly. You could try messing with the contrast too, see what that does (not that I have any idea what it'd do; I'm out of practice with image editing).
Text could use some work though, its kinda small for my picky tastes. Maybe try upping the point size by 1-2 and/or bolding it and increasing the tracking (space between letters).
Yuugi is referred as a male. Anyway, Yukkuris are hermaphrodite and i have 0 English skill. In my school, teaching language is french, there's a retarded English program and an advanced one. As you can see, i'm in the retarded one. I will try messing with the contrast next time, with bigger font and all stuff. Thank for the advices.
I like this Yuugi. Is she the same from post #35839?. And lol at the smiling tree. About the brightness/contrast, I recommend you the 'level' tool in the GIMP. It's simple and gives good results: http://i.imgur.com/w2vNl.jpg