If I wasn't pressed for time I'd actually give you some feedback, but for now it's just business. Meaning I moved your thread over to the main Pixel Art forum where we keep the showcase threads (Projects is for games and shops and things). Now, the rules say you need 4 pieces of original, non-fusion/recolor/revamp/etc. work to start a thread here and you only have three, but it can stay here for a little while at least so you can add something else.
My first impressions are that the outlines are somewhat light on the first two sprites. The fire-fox (?) has a very light outline around most of it and it would be more of a problem if the shading wheren't there. As it is the shading gives a pretty good sense of depth so good job on that. The unicorn looks kind of rough in the horn area and the shape of the head doesn't quite look right to me. The legs are varying in size, too, and I'm not sure if you can have that one crossing over the way it does. Also note the pixel in the tail (there's one in the fox's ear as well) where the background color is missing.