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your staircase block is nice. use natural store cladding, if cost permits, else some nice stone designed tiles should also do the trick. as per the tile/stone, you can either go with the similar family for the rest of the wall painting. ensure the moldings/projections are painted in lighter tone than the walls, so that they do subtly stand out.
As I can see your staircase block is the highlighting element of the whole structure. You can really play well with it. Some earthy cladding from Tunch Bricks would surely enhance the overall look of the elevation. Products suggested are Metallika and Sunburst in a patterned well as reference image is shared.
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What is window size?