every last piece of info is important. descriptions help google and the buyer. the buyer has to know about the image. the title is important - imagine a newspaper that didn't have a good title to attract attention? while some people poo poo keywords - you need those two.
don't get too creative with the title, avoid - untitled -- this 1,2,3,4,5 etc. descriptions should be from you, and not wiki, or google will ding you.
---Mike Savad
http://www.MikeSavad.com