Before starting any real sketches for the Raindrop world I decided to do some research and look at existing concept art for water worlds. Below are some examples of the research I found.
All of the concepts are all done in a cool colour palette and in shades and tones of blue. There are some different styles of digital painting through the images but i liked each of the pieces.
The perspective in these examples are what I want to achieve in my own thumbnails for the world. I hope I can achieve similar results to the ones below.