We can already begin to see how the light source will govern our final look but before we go any further it is a good idea to introduce a little colour variation as it all looks a bit monochromatic at present. On a new layer set to Soft Light which I chose to call "Colour Overlay ", I painted in a pale orange-grey colour across the whiter areas apart from where the light is most intense i.e. the ceiling vents and floor directly underneath as well as where the light catches a few columns (see the image below). This will help add some warmth to the scene and give the overall colour scheme a more realistic feel.
Step 6 :
Now on another layer set to Soft Light using the same watercolour brush as before I selected a mid blue-grey hue and blocked in some cooler tones that would fall mainly within the shaded areas but not exclusively (see the image below) This will add a subtle colour variation to the stonework and prevent the scene from looking too much like a sepia photograph.
Step 7 :
We so far have four layers ( not including our selection folder ) in our PSD file and with a generalised colour scheme in place it is a good time to flesh out the lighting a bit more and add a more realistic level of contrast. The scene already demonstrates the preliminary light and dark areas but still appears washed out so we need to add a further layer which we will call Shadows and set its blending mode to Multiply. On this layer I chose a muddy, darkish brown and added the darkest parts of the scene mainly along the sides of the columns and walls (see the image below). You will now notice a marked change in our picture and by darkening much of the space we have essentially made the light appear brighter by comparison and added much drama as a result. We can already get a feel for how the scene may end up but there is still a "black and white " look to the picture caused in part to the white areas.