Yes, you have to write a comment at the least. You also have to provide the source of the scan you used (I do think it's Tens vector, not sure). It would be nice if you can make it in a bigger resolution 1920x1200/1080 at the least. is n@ri your signature? Because if it is, it's better to also use your minitokyo username or something where you can be recognised from. It's also quite an eyesore, the way it was put in...It ruins everything so I suggest you re-do your signature in your wallpaper.
As for the comment you have to put. You can make it very short or just long. It depends on how much you want to define your hard work in words to others.
As for the rest, keep up the good work. New artists are always welcome on this site.