Solider in the front looks like he just slipped on a banana and going to fall down ^_^ , do something with his left (to him) leg. Perhaps...add some motion blur to Mi-24 and try not to waste so much space on the left and right sides. Those SAS and GSG-9 guys aren't realy important. You could probably just do Mi-24, a solider running away from it and some sparks effects, it would look better.
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The "shitty bonus" actually isn't so bad. Again, what the hell is with the right leg of the guy on the right? It can't be SO straight, bend it a little bit (just a bit so it won't look like a stick) and move his upper body forward a bit (imagine yourself or anybody else running - have you ever seen a human running like a robot - with straight hands, legs and body straight up? lol ^_^). Blood effect on guerilla on the left looks good...you could use better muzzleflash effects though...maybe those ones -
http://www.garrysmod.org/downloads/?a=view&id=61222, because the only MF that I see is coming from Ingram, but it's too far away from the actual gun. So move it closer and download a better muzzleflash effect.
You're on the right track, keep it on +1.