Hey, had a question I was hoping I could get some help with. Recently commissioned an artist for the first time to draw a couple of OCs. Thing that makes it a bit harder to know how much to tip is that I didn't have any previous reference pics for the characters, just a written description and a couple of photos of things that inspired their looks, meaning he had to do character design work in addition to just the art. What's a good percent to tip in this case? Thanks!