Unfortunately, it looks more like an illustration than a picture. The reviewer was unable to say what was the subject of the pitcure.
This looks like art. But Adobe Stock is not an art gallery.
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This seem to be abstract art. Nothing is wrong with abstract art. I believe there is a market for it. I am not sure about the saturation. In my opinion it is a bit too saturated; but that is my opinion. The black areas though will not make it. The black probably will make it for edges, but definitely not for an entire area of saturated black. That is what I think is the issue. If you are representing shadows, then probably you could try grey, or lighter shade of one of the colors you already use.
I suggest you take out the black, use some other shade and resubmit.