I know we're looking at the same pictures. Maybe my monitor resolution is better than yours. The horizon line is very discernible in both. If it helps, look just above the highest point of land to the right side of both pictures. The horizon line is just above that, and travels in a straight line from there across the entirety of both pictures.
That’s not a horizon line that’s where the ocean in the foreground of the pic on top meets the haze. In the second pic it isn’t discernible at all.