Cenral.

This is my idea of how a centaur/thestral hybrid would look like. Looks slightly orcish/drowish. The lineart made with pencil, but all the colouring, smudging and softening is made with computer (Paint Shop Pro 8). I'm actually quite content with the colouring... It's not exactly magnificent, but I think it's good.

(I'm not sure if the thestrals are commonly known creatures in any mythology, or if they're solely J.K. Rowling's creations. Therefore this pic is placed in the fantasy category and not in fanart.)