Already the "delete Artist entirely and move on with Speed Demon Michelle Kine" idea is becoming more and more tempting...

@Eyeris I have indeed asked for opinions and I will answer them:
The "draw to scale" limitation seems too high a price, as it makes him require several square feet of paper, which is just much too cumbersome for practical use.
Quick sketch over oil painting does seem like an interesting limitation, and I may add that in.
For control, I would say "complete dominance" for his own safety as well as everyone else's, since sentient beings might abuse their own sentience and attack Artist himself, though now that I think about it, it might be an idea to change that "complete dominance" idea and perhaps add this as a limitation (considering, not quite accepting).
Giving him powers he doesn't have is an ability I am trying to limit as strongly as possible, as already mentioned several times.

@Gisk Your "two cents" is worth more than a hundred bucks, since everyone has equal say (with the possible exception of the GM).