Here's how it breaks down, no offence meant or anything, I do it to help. ^_^;;
Kinda using Ryan's system, but with explanations.
Creativity: 8 - Definatly a different theme, good to see difference. I think there's only one other person here who made a horse-based signature.
Colors: 5 - I personally think it's a bit dark for the horse theme. Sorry
Text: 6.6 - Nice font, flows with the sig, but it's awefully plain.
Border: 8.5 - I really like the border on this. Good job.
Rendering: 6 - Not bad, & after more practice, you'll be a lot better.
Background: 10 - Like with the border, I really like the background. The only thing I find wrong with it is the darkness.
Overall: Overall, I say that this sig gets & deserves a 7. It has it's up & down points, like anyother.