The perspective of the head looks iffy in the Tauros drawing, considering the animal appears to be mid-gallop having the head exactly flat side-on looks very bizarre, and how the nose appears more 3D when the jaw isn't.
Another thing is the hind-quarters: Notice how you've drawn the abdomen overlapping the leg? It's very unusual to see that for an outstretched leg - or we're talking about a really fat Tauros here. Usually the leg would blend straight into the body when it is pointed backwards, this is emphasized even more when an animal is running, it will then come forwards to be outlined over the body.
Other than that the shading is really good and I like the perspective, good to see somebody trying really dynamic positioning as well instead of having it sat on its arse.