Those look pretty good!
I like the variety you have here. The designs are overall good and catchy, and I like the different color themes. The colors are very catchy, and I love all the shinnyness!
However, it seems as if there are some problems with anatomy. The heads seems to be too long compared to the rest of the body, atleast in the majority of the drawings. Take for example, Scorpio. The guy in scorpio measures 5 heads. An averange man measure about 8 heads. So right there you're missing three heads. Try looking for some guides around, I'm sure it'll help :)
So those are my two cents! Keep on the great job, kudos!