Yoo bro, that's some cool stuff right there !!
That's really wise of you that you made the colors a little bit easier to the eyes
Tha only "wrong" things are maybe that you didn't drew the other set of legs, and you should try to really get the back legs right (they are really tricky to get, but once you got 'em right, it's all good), the square thing in the back is an articulation, the thing is to make it look smoother
Also, you should erase the parts of the lineart that aren't useful, like on the chin for example, it'll look better ! But I like more the style of your lines, it's already looking way better