I finished now the black & white version of the concept art, and im ready to add some colour, I added some small details like spider webs and grains on the floor to add the abandoned look a bit more. As it can be seen the light is coming out of rooms and casting on the hallway. I added some textures on the walls to give the look of wallpaper fading or falling.
Jpegs can be quite tricky as the quality lowers a lot. as whole the image looks like this and is ready to add some colour.