biologically unsound. Not your fault, just the new zergling is an evolutionary step backwards. It's far too bulky, and due to it's messed up center of gravity it seems it would often fall on its face. It would be far better suited to the niche of a scavenger than a voracious pack animal.
Sorry I needed to get that off my chest X:. Now I must say I really like your rendering. The texture of the protruding veins is quite good.