6/10
9/10 Make is 600X80, I think that size make best sigs. I don't know about the pattern you put on it, but I really like the renders. Maybe a different font for Prototype. Then again, maybe not, lol.
There are guide threads you could ask about gimp, I use photoshop so not familiar with gimp to whether thats good or not. Doesn't look bad though, but it looks a bit scrambled up, I cant see what the main theme is supposed to be.