Yeah they look alright, i like your ponysona the most :3 All you need is them in vector form maybe in a pose and that would be freakin awesome. good ol high res.

On a somewhat side note I can't really tell you if they are good or not, that's all up to opinions and that changes from people to people. So really when making artwork it's really you asking yourself that question. I have "thrown out" tons of other vectors that i thought were not good enough to post on here, ironic is that it just happen. I tried to re design one of my OC ponies and uhh really didn't turn out that well. haha