Sketches
$10 with an extra character being an additional $5.
Lineart
$15 with an additional character being $10
Flat Colours
$20 with an additional character at $15
Fully shaded
$35 with an additional character being $20.

Backgrounds vary on the amount of detail you'd like. A simple background colour is free. But with things like scenery (chairs, simple props, walls, etc) it's $8. Detailed backgrounds are $15