Hey thanks for letting me know, I've read the rules before, but since I didn't know of any differences I was unaware of this!
Oh is it? I didn't know, like, I thought that selling merchandise was prohibitted (with all the rights) but since it's a service to draw the players characters, I didn't think it would hurt anyone ._.' Thanks for the advice tho!
Also, thanks a lot to everyone who's interested in this thread! For anyone who's in doubt, yes you can ask for a commission without having a tumblr or deviantART account. All you need is to fill in the google form in my tumblr ^^~