The art is edited and cleaned up manually, but it's mostly minor fixes. We don't have an artist redrawing anything if that answers your question.
Viewing post in DeathBattle Princess V1.1 Release comments
Yep, it does answer my question. You should try hiring one, it may make more people play your game, in my humble opinion. A lot of people have biased opinions and disdain towards pure AI art without human editing.
Don't get Me wrong though, there are people who would play a game just for the concept, not the visuals or graphics, like me for example.