I don't to Sketches but will start with black and white to fully shadowed and highlighted.
Black and White: 15$ - 25$
-Bust: 15$
-Half: 20$
-Full: 25$
Flat Color: 30$ -40$
-Bust: 30$
-Half: 35$
-Full: 40$
Full: 40$ -50$
-Bust: 40$
-Half: 45$
-Full: 50$
Reactives: 45$ - 55$
-Bust: 45$
-Half: 50$
-Full: 55$
Chibi: 30$