Here are a few quick sketches for the island level. I expected them to have a bit better quality, but these are from my Google Nexus Tablet. I will have to double check if I missed some settings or something.
Update: I can save my sketches from Sketchbook Pro as a PSD. I sent them to photoshop and saved them as png's and they look better. Not sure what the deal is.
The first illustration is supposed to be a crater with a body of water in it followed by a close up of three islands. This was a quick demo as I am still getting used to drawing with a tablet.