Sketches are $1 head, $3 abdomen, $5 full body + $5 every extra character.
Inked are $5 head, $10 abdomen, $15 full body + $7 every extra character.
Colored are $10 head, $15 abdomen, $20 full body + $10 every extra character.
Extra shading normally doesn't count extra unless you want extra characters. Then that would be $15 every extra character.
For more detailed work (like my Kaili Burns post). A normal profile/semi-profile goes for $50, $75 for abdomen, and $100 for an entire body. For every extra character, that would be an extra $20-25.
(Interested in some art? Comment and I'll get back to you asap 👍)