Tilted? Looks like the poor critter is about to lose his grip!
Colors and contrast are a bit dull, I'm afraid. Some curves adjustments would help that. A good tutorial on curves is on DPC right here.
Also, your file size is a lot smaller than was allowed. It's only 35k and you could have used up to 150k for this challenge. You have certainly lost some clarity and detail to JPEG compression. Check the JPEG compression settings in your image editor and always try to save as close to the limit for a challenge as you can get it without going over.