The looks and art style are good for the most part. They fit their theme very well. I'm not a fan of the pony necromancer or changeling hunter ideas. The former wouldn't exist in Equestria, and the second I have serious doubts about. The necromancer does seem a bit generically "dark" looking and would stick out like a sore hoof in public. Overall, The looks are good, if a little generic in the necromancer case, but most of my qualms are with the occupations of the latter two. The first is just perfect.