Rough outline:

Started colouring:

Shaded:


What else should I add?

I like the first one, it has a nice graphic quality to it. But you want to add stuff, try adding shading and form using a darker color with a blur. Or you could do a repeating fur pattern, that might look neat/

You could've at least been more creative with the hooves when you traced this.

maybe just stop at the torso altogether, with a fadaway or whatever. as the original legs would be difficult to cartoonify anyway, and the stand in legs added don't quite seem to fit well. then more time could be spent (if desired) adding more detail to upper body. some of the lines can be carefully made smoother by using a combo of simplify and smooth nodes. you need an original image at least 1000 pixels wide and high, to be able to inspect detail; otherwise zooming in just shows blur.