p l u t o said:
I think its mainly because of the designs that it looks off. People can be amazing at coloring, but sometimes the designs of the characters just ruin that all.

Hmm, airbrushing isn't exactly bad, but some people tend to have a pet peeve against that. Try to airbrush less, and smudge/blur it a little bit instead.

Also try to look at what direction the fur mainly goes. This means to look at the lines themselves, basically. Then you can make some fur lines instead of what ya did here with the coloring of the blue one's back and tail markings. Those markings seem to be round and not really follow the fur. If its part of the design, then you can leave it like that but occasionally add some fur lines.

Hope this helped ya