No canon characters (ex Naruto, Ichigo from Bleach, etc): Only OCs! Written descriptions are fine if you don't have sample references. If you don't have refs, however, please ensure you have HEX codes for your character's colors so that they are as accurate as possible.
Once final image is given, you're allowed to ask me to make minor edits up to two times. This can include things like tweaking the shape of small features, tweaking colors, adding markings and other small things.
I WON'T do things like draw entirely new poses, facial expressions, changing a character's full outfit, or any other things that would require several hours of added work unless this is being paid for. I generally find that major edits like that aren't something I can just do without compromising the quality of a piece of art. In those cases, it is better just to redraw it to ensure that you, as a commissioner, are getting a piece of art that showcases your character as perfectly as possible. :)