Organic Cow Modelling

Been doing some organic modelling in Z-Brush and working my cow over. It's completely and utterly (get it utterly) shit. But more practice and hopefully i'll get it. Still having massive topology problems.
In the way that I just get over zealous with my topology and then it gets either to Hi-Res or unformed and polygons' all over the place.

Anyway here's some snippets of my shitty cow. I found that I had some wonderful holes in my mesh around his mouth as well probably from some nice double extrudes or something. Still a lot of work to go on with in both Maya and Z-brush.