Fist: the picture is not horizontal, and there are artefacts.

Your second:
Noise on the leaves, over saturated.
Your third:
Nice sunset/sunrise, at the first sight. Artefacts at a second:
, underexposure on the tree's fruits
. Noise and more artefacts.
Your fourth:
Oversaturated and noise (in the sky). Strange traces in the sky.

Your last: over processing. The foreground horse needs some shadow lifting.
.