It's a nice scene. 
Some PP considerations you might consider exploring:
1. The highlights on the hills/land appear over-exposed (blown-out), so maybe using the recover slider to pull back the reins on the highlights. A highlight doesn't have to be white to be blown out. If any of the RGB color channels are clipped, it's a blown-out highlight.
2. You've got a nice rainbow! So why not exploit it by selectively raising the saturation on it?
3. There's a white pipe hanging on near the bottom frame (left of the pole). It's not bad because it's a white pipe, it's just awkwardly hanging there causing distraction. So, if you can, remove it.