3 days work, need your advise to make it more attractive to clients

almost looks like a photomontage to me... that's pretty good amount of detail for 3 days. Clients will be happy.

The sky is the only thing that really gives away that it it isn't a photograph. It looks like the background was cropped out and that sky put in place. The buildings don't quite blend with the background. But maybe that is just me. Regardless it is a very nice render, I love the lighting and reflections. The buildings look really good. Nice job.