Thanks all for the input!  This has given me insight about what I should and shouldn't be doing for charging hehe. 

I only agree to take on projects that I'll enjoy myself.  If it's content that I'm totally against then I don't agree to it because I know it's gonna have an impact on how much effort I put into it and, ultimately, the results.  That's what happened with my first commission requester.... the content he wanted was offensive to me, but I figured I'd give it a shot.  And every render was like "ugh.... this sucks..." So I make sure the requester tells me what their idea for the story is before I agree to take it on.

Wish you all luck!