Familiar Shade

Offline
Hey there~ I've been considering selling my art on Gaia and I haven't really figured out what would be fair price.
So I've decided to ask for some help.
Also, I'd like to ask for a little critique, if you don't mind! I'd like to know how I can make my art more appealing.
Samples:
Sketch/Full Body
Sketch/ Torso
Sketch/Head

Color/Head
Color/Torso