I think I can have some improvement ideas as a fellow 3d-artist. These are just an opinions, so nothing too critical. Even when it is a render, it's still being compared to real photos. As a "photo", its slightly boring, but that can easily be changed! First: If you were a hotel owner, trying to have customers with your website, would you buy a photo of a scatched old looking "do not disturb" sign photographed on a cloudy day hanging from door hadle that's seen better days? Or would you find a photo that is little less scratched, photographed on a nice day? - The lighting atm. looks like a cloudy day, giving quite sad mood to the image. So some better HDRI can help with that, or additional light sources. - The blue frame seems to be lacking textures. At least add bevel modifier to it - The background wall texture seem to be quite low resolution. I would find some completely other texture for that. Mabe some little more expensive looking material, such wood? - Reflections are always cool, so if you change that sign to be some sort of a plastic, it would really make it look better imho. - I would also turn the sign angle slightly to something ittle more dynamic looking. Perfection rarely exists- . - You also said there about the "negative space". The composition easily could be changed to have little less of that door, which is not giving much additional "story" to this image.
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