None of these images are sharply focused; in addition the 3rd one is quite underexposed and has a white balance problem. Keep in mind that flowers are very over-represented in the Adobe Stock database. In order for your flower images to be accepted they have to be perfectly executed in terms of focus, exposure and composition.
Compare your work other Stock contributions.
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Hello, as mentioned, generally, the focus is just too soft, and the third is definitely underexposed. It's too dark.