I like your crazy enviromentals really. And I love your posts in general. YOu are one of these guys making this place better.
But your figures and faces don't convince me. Look at Frazetta, Capullo, Huante to solve that and understand how they do that.
for example page 20 and 21, the alien:
Imagine that you are that freakin alien riding that thing, ready to slam and rip someone's fucking head off. Strike out while your eyes are wide open because you are sceaming, feeling the energy energy that you are about to release with all brutal force that nature has given you. Feel your pec tearing apart while striking out. Feel the cramp in your shoulders because you are pulling your arm back like a bowstring. You know what I mean?
Also, the zombie or creature is shown in profile. Do you want to show a dizzy zombie, who doesn't realise the danger of the current situation? If not, give yourself a hit. Turn him towards the guy who will kill him. Showing the face is not so important as showing the body language in this case.
You can do that better. Just think like you are fighting. Go crazy in your workroom for a moment.