Sunset

I started by making the sky using a gradient tool with the radial setting. I then made the sun by selecting a circle and using the radial gradient tool again.
To make the water I selected a rectangular space and used a linear gradient with blue and a lighter blue. The cool water effect was made by rendering Lava by going to "Filters->Render->Lava...". I then lowered to opacity of the Lava layer and erased the rest that was not over water and changing the color to blue.
The ground, bush, and snake were just using the brush tool to add more to it.