hi and nice job,except for which you already know,i love all other things about this pic,specially the lighting and texture details,congratulations…
BTW three more things i like to add:
1-the two walls one on right and the other on left,are not as dirty and realstick as the background wall,which some goes for the shadows and lighting,and the diffrence of colors ,maybe less saturated,i think you could add more details later in photoshop,but now for me they look so CG and polished
2-the monsters designs,except for the left one.they are more happy and funny,maybe Dumb and there is no feel of danger or menace in theire face design,not expressions,but design
3-and the rain,there are no splashes on bodies and nothing looks wet,and the rain density is the same in every parts,in more depth parts,they should be much much more,and the size,those in foreground must be bigger but now they are all the same size
but again nice job,i think things like these are the simple but yet effective things that can make your scene more real