Eternity said:

Considering your gallery includes both digital and traditional art, I'd recommend specifiying if it's digital or traditional.

Digital art sells for a lot more than traditional, typically. I'd also recommend saying what banners and avatars include [if it's a headshot, fullbody, just colours/scenery, etc etc]
I'd say you can definitely put your prices up higher than they currently are! I'd say at least double in price.

Also, just to note, if you host any auctions they need to go in the 'artwork' section of the forums rather than art shops :>