OokamiD: It's all very well done. I'd go for the following in price range.
Pencil--- 400 to 500 gold
Ink--- 500 to 600 gold
Pen and marker--- 700 gold
Animated--- At least 1000 gold.
Since your shop was around so long ago I wouldn't think it a negative impact to open a new, fresh one to start over. But I'd ask a mod first just to be sure. I really hope you do, though, I'd love to have art from you in my collection!