I am still slowly learning Blender and trying out different features in the software. I put some of the tools I recently learned together into a rendered image below.
The moon is a sphere with an emission shader, casting light on the scene. The texture on the moon is a simple procedural noise node.
I generated the background trees using the “Sapling Tree Gen” add-on that comes bundled with Blender. After creating one tree, I used the particle system on a subdivided plane to create a forest.
The water is just an Ocean modifier on a single plane, with a simple-yet-convincing shader node network. The fog and clouds are different volumetric shaders. Each cloud (there are three of them) is a different cube, although they use the same shader network.
Finally, I downloaded the character standing on one of the platforms from Mixamo, a service from Adobe that offers free rigged characters and a large library of animations for those characters.