A friend recently told me about a website that i thought would help a few of you out!
"TinEye is a reverse image search engine. You can submit an image to TinEye to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions. TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks."
Main Site - [link]
Example - [link] Using Seasonscape by `alexiuss
I hope this helps you out. Spread the word!