Photos Not Accepted

[Gabby2180317881u1]

I'm a new photographer and these photos weren't accepted due to techinal issues. If anyone has any tips I'd really appreicate it! 

[RALPH_L · Accepted solution]

Photo 1: overexposed highlights in the clouds on the lower right. All shadows are underexposed.

Photo 2: Horizon not level. balance is off. There is a red-magenta tone. Artifacts along the horizon. Not focused due to a shutter speed that was too slow.

Photo 3: Horizon not level. Artifacts along the horizon. There is a red-magenta tone in the sky. No clear subject.