Hoo, boy... Never try to fix a Paint drawing in Photoshop...
This is actually an old drawing, from back when I first got my tablet. I thought I'd try touching up on it in Photoshop. I failed miserably, but I'm gonna post it anyway.
Awful background, but actually kinda better then before. And yes, those light spots in the water near the ground ARE supposed to be highlights.
Enjoy!