view your photos carefully, check your exposures. Photos 1 and 4 are underexposed. Photo1 has spots in the sky that need to be removed. It also has color noise in the sky. Photo 2 is out of focus. Photo 3 is not well cropped and has overexposed areas.
Photo 4, like I said, is underexposed, noisy and the horizon is not level.
Thank you for your feedback, it is very clear and explaining. I will keep in mind :))
1. Too dark.
2. Focus issues, not framed properly.
3. Cluttered (what is the subject)?
4. Way too dark.
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Hope that helps.