Silhouette check

[meat]

This is an eye-less, prairies herbivore creature based on rhinoceros. It'll go from thumbnail to color concept to zbrush sculpt, as a learning experience project. Any thoughts on how the silhouettes are interesting or not to you? 

I need to finish both concept painting and sculpt (hopefully with texture) by the first week of March, and right now am at the "what's a z sphere?" stage, watching a sculpting tutorial...