Were these pics taken with a smartphone?
The quality isn't very good when viewed at 100% or more. (You need to view at least 100% to check for defects in the picture.) In your case when doing so, the pixels are becoming smudged.
Have a read of this from Adobe about how to create better photos:
View youir photos at > 200%. The first has a noisy sky and halo on the tree line. The secon has artifacts around the wires. The third is not sharp and has too much white sky.
I'm new to photography. I took the mountain photo with an Android, and the other two with a DSLR. I appreciate your feedback. I'm learning as I go.