The first image is high key value, the light that came from both outside and inside created large portion of highlight. Due to the surface texture of the wall, the light are being reflected to the top and created repeated pattern of grey and dark grey.

The second image shows a low key value, light sources are only coming in in one way which left whole composition predominantly dark, and a obvious contrast is being created between light and dark; however, there is a lighter value of dark that is between the light and dark.