Hi, it's a cliché, I know, but I really care about the finished product. In other words, you wouldn't see anything wrong, but I know it's there so I'd rather fix it if time permits. To that end, whether I'm on an hourly rate or fixed, I'll be on my dime, sometimes to get everything right. I can be highly detailed, or am comfortable with stylized realism or cartoony in Illustration, or 3D art.
All that being said. After all is said and done, if something turns out to not be what was wanted, included or needed, should I have to go back and alter things, short of redoing it entirely, you won't hear an argument from me or a complaint. Because after all, the commercial aspect of this means it's created for a purpose.