Nico, Upon a quick review I see blur, underexposure, noise and lack of detail in the shadows. In a dark garage, you probably would have had to put your camera on a tripod and take some fairly long exposures, at low ISO, perhaps bracketed images then combined in HDR, to get a good overall exposure. Keep in mind that the moderators spend a very short amount of time on each image, and they select the most obvious reason for rejection; which, most often in my experience, is "technical issues". Since there can be many different technical issues, they do not elaborate and, indeed, it is not their job to help us become better photographers. This forum is a useful place to obtain further detail. I suggest that you select the BUY button on Adobe Stock main menu and query "parking garage" to see the quality and composition of the images that have been selected.
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