very nice mood.

Very nice darkening and blending

Nice work with the darkening and shadows

Great job with the HDR effect! It really adds a cool feel to the image.

Suggestion: From looking at your high res, I think you need to do a little more work on the cloud reflection. First, they are a little too sharp, so you might try filtering them to get the desired distortion effect. Second, they are in front of the building's reflection, which obviously isn't the case when you look at the main image above. You should erase or mask out the clouds in front of the building. Good work and good luck, author!!