Me gustaría saber por qué me rechazan mis fotos

Mujer: underexposed, white balance issue, processing error with the arm

the foot is missing:

The sky is noisy, and the image misses contrast.

MTB is missing exposure in the whites and in the blacks.

You could still pep up the image with “texture”, if you like.

Torre is overexposed and clouds are missing structure. I would add some sky, cut off some of the bottom. If you have Photoshop, you could try the sky replacement filter.

Puente: The water is a dark hole. The lens quality is falling off at the borders, leaving the asset with artefacts. This is seen at 200%, where the asset should still be clear and sharp:

The same situation more at the middle of the image:

The sharpness is better.

Torre antigua.jpg - blownout areas in the clouds 

Puente de Alcántara.jpg - shadows are underexposed, making the water appear to be black 

Overly saturated. Remove the woman. Looks like a personal vacation photo. No commercial value. Save images like this for Facetime.