This is my final concept so far, it is not totally finished yet, because I want to work into it a bit more. After I finished painting it in basic black & white I started messing around with the colour balance.
This, in my opinion, is the best version. I have used greenish colours to create a sense of creepiness. The colour reminds me of some Japanese style horror movies. I want to work into this with slightly washed out yellows and browns to try and replicate the Japanese horror movie effect.
Here I have tried using blue to make the enviroment seem could and unwelcoming.
This is the original black and white version and a high contrast version (above).