There's too much of the FG tile to my taste, which I'd cut about in half. Rather than crop, I'd like to have moved closer, but even a crop looks better to my eye. The square to the front view actually works reasonably well, but the outer walls seem to be tilting about one-degree outward, so I'd try to get those perfectly parallel.
Hi Gabi
I agree with David that a little off the foreground would help. Check your levels as well as the vertical edges of the building. I have a feeling the level is out, but it maybe just the distortion tricking me. Increasing the contrast in the sky will add more moody feeling, but I quite like it as it is.
Hi Gabi, I actually like the tiles and the way they lead you up to the door of the museum. I wish that the museum was centered in the composition and that the sun was hidden behind one of the clouds...if you waited a few minutes would the sun have been behind the clouds? Looking forward to more of your posts!