Personally, I like Feebas' design. As Braixen said, the colors go well together, and they're also good, bland colors for a fish. It's sunken eyes and frowning mouth make it look "uglier." One thing I never liked, though were those triangular marks above its mouth. They always looked kinda like nostrils and that weirded me out cos he's a fish.

Overall, 7/10 since it's not the coolest looking thing, but it's good or what it's supposed to be.