Appears slightly oversharp to me, but upon looking at the file size, I think what I am seeing is actually the result of excessive JPEG compression. Compression kills detail. Always use the least compression/largest file size you can get away with.
Nice composition and technically very good. I'm not thrilled about the diagonal here but it's a good shot none the less. Cool horse, beautiful sky (maybe a bit oversaturated though?), but not much wow factor. 7 :)