I'd probably be something like this...
(1) Chibi Fullbody ; 150,000
---------Chibi Headshot ; 75,000
---------Chibi Waist-up ; 100,000
(2) Full-body ; 250,000
---------Headshot ; 100,000
---------Waist-up ; 175,000
That's of course, assuming that I really like what you want me to draw.
Because often times I'll get stuff that don't have good references or whatever the circumstances might be.
Those sorts of stuff makes me nervous too since I don't want to mess up designing someone's character?
But yea, that would be my baseline I think.
EDIT; oh and don't worry about offending me. I'm stupidly hard to offend, like, I don't overreact over anything really. And if someone does happen to piss me off, I just tend to erase their existence from my mind (wow that doesn't sound ominous or anything) SO YEA. I'm not a sleeping volcano or anything. And I used anything like a dozen times in the span of 3 sentences. FLAIL;;;