Zergling will replace Swarmhost 


Why does it have such a flat head? Even if you want it to look blocky, I'd suggest rounding out the skull at least a little bit, and making the body a little more round-ish/natural as well as slimmer- as shown in the above image. The legs/feet also look a little too wide and clunky.
Other than that, you're getting much better at modeling than you initially were and the practice is showing- however there are still a few things you need to work on, and then you'll be good to go!
Oh also, make SURE you use reference images, they're pretty much the best way to get it near perfect the first time.