Hi Michel,
In a photo editor, or photo viewer, zoom your file to 100%. Check the edges to see if they are sharp then. Images that are not sharp at that magnification will not work.
For those that are sharp, example the last image, check for noise/grains, and artificial color spots, and also color fringing at the edges. All the images I look at have noise/grains, both grey luminance noise and colored chromatic noise.
Look closely at the images for color cast. The second image, for example, has blue color cast.
Check if your images are looking flat or vibrant. All the images I look at need to be warmer. They are not vibrant.
Check for details. Those that details are lost when zoomed will not work. Your images need to have clear contrast.
Issues such as noise/grain, chromatic issues, and temperature issues can be corrected. The others cannot work.
In addition, your cropping is not good. That you need to improve on.
Best wishes
JG
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