I have to disagree with Marideath. I like the idea...the thumb attracted my attention, and the colors are great, but when you blow it up the execution is clearly flawed. It feels sloppy and unpolished. I think it you worked on it a bit more it would blow up a lot better. As a rule of thumb, if the thumbnail looks better than the full sized image, you haven't done a good job of polishing your image. I encourage you onward.
True, True, I did not spend a lot of time on that pic, I did it in a hurry, but many thanks to the comments, maybe i will rework it, if i can find that Bryce CD......