Thanks Mayastatic!

All of what you wrote was very useful, I will keep in mind what you were saying about the contrast of atmosphere, I will give it a go by changing the light colours for a slightly colder feel, I understand what you were saying about only having one monster approaching from behind, and considered that originally, but the idea is that he isn't scared. He's not at all worried in fact, because he's about to kick their asses!
I guess both ways would work, but I'll most likely stick with it the way it is for now. I'm working on some other bits now anyway, so will be leaving this for a short while and coming back to it in the future.
But thanks for you comments and crits, they are very much appreciated!