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To me it seems that the sky is indicating the sun to be just to the top right of the skylight, but the shadow indicates the sun to be lower on the horizon on the left. Also if I cover the top half of the image, what I see appears to be a more overcast day. Phenominal model.

A nicer shot for sure . Drama yes. The shadows add as well , Maybe a tad bit more overall light.

Also that wall being so massive can it be softend up with some cast light? What is suppose to be above that wall ? is it opend to the sky? Then the warm summer sun light should break the top a bit.

I agree. people add life. You could also try reducing the saturation of the browns at the decking, also the grass has a astro turf look. cold. Nice model. You select those individual colors by using the wand and then select similar from the drop down menu. Might have to play with the tolerance.