Whoops, in fact that wasn't what I understood Tommy's. It's not the pen tool! I don't know what is its name in english, but it's this one:
Well, here's the last one. I won't have time to make something better, so I prefer to post it now, than not posting it at all.
IWANTTOENTER! D:
Artist Name: Zav
Artworks Name: Behind the scenes
EDIT: to not be off topic, I'll answer you here Tommy's. I draw with a 6 pixel brush. The original size of the drawing could be x1.5 or x2. Not that big ^^
Indeed I do ctrl+z a lot!
I try to make one line by one tablet pen move. If the line is not the one I like, I can ctrl+z more than 20 times