Righto; there are some problems here (don't get me wrong, they're minor and easily fixable).
The main one is a 'phenomenon' known as laser-edge-horizon. Pretty self-explanatory; it is a completely straight horizon.
There are two ways to avoid it; one, reduce the visibility in the weather/user-defined weather/advanced weather/visibility tab, available by pressing Alt in-sim, and going to the 'world' drop-down menu.
two; simply use the advanced weather tab to create a cloud layer that'll mask the problem. This is often preferable as you still get the sun fully visible.
All-in-all, a nice shot, but there are things that could be done to make it even better!

P.S. I'd also recommend turning off lens flare in your in-sim display settings screen.