No. Try using the blue and the green while using the grey to neutralize whatever looks wrong in bits to create the illusion of the shadow side. Leave some red tho.
Thank you. In fact I wasn't quite sure how to fix that, specially on the chimney, adding a lighter line in the corner maybe?
Nice job. I do think you have colors already in use that could better define the shadow areas of the chimmney and roof windows.
Looks amazing! Could be a 3D model.