What to Charge
 

I'm getting ready to set up an art shop here, and I'd like a bit of pricing assistance for arts. I work primarily in traditional art, fiddling with digital, and I can do anything from a headshot sketch to a full-blown, full-page work complete with background.

This link here is an example of art I've done in the past (the art I do for here will, most likely, be uploaded to an album here on Mene, because of a not-so-smart idea on my part has made that dA account inactive of my own volition), and before I start up my art shop I'd like a few suggestions as to what to price my work at? Or even if I should start an art shop at all, because the last idea I had...kinda crashed & burned.