This is coming along very nicely! Your really taking on board all the suggestions people are making, but more than that, your making this wonderful image your own.
The lighting is so much better and the feel of the scene is really coming out.
I think the standing human might do better if he was standing with one foot back in a kind of shocked pose, maybe with an arm raised.
Your composition is brilliant on this picture, my eye is drawn to the unconscious human, and when that badge on the alien is filled in, my eye will drift there without stopping too much.
I recommend a subtle pattern on the badge, nothing that takes your eye away from the dying/dead human or alien.
But seriously mate, your work is inspiring me to keep going with mine, even though I may not finish it on time.
Well done!!