put up an avatar btw.
i think it will print because of the sheer size, but its not really that sharp up close.
this has a dirty background, and i see blocks, check the compression.
scanning your work is fine provided the scanner can do a high dpi without interpolating it. otherwise it's just like stretching it in photoshop. you should increase your prices, and add descriptions.
for the most part though, except for a few, i see no issues i'd worry about.
---Mike Savad
MikeSavad.com