I'd say at least 1k for fullbody. That would be the flat colored ones.
More for shaded. Like 1.5k-2k.
Waist-ups could range from 500g-750g.
I for one would love some art from you. > w< <3
I've seen your art post thread and I just love your work~
Though I'd have to say I'm more interested in your lineart/non-colored work.