Here's a rough WIP of a smaller high res mask I'm preparing for a zoom animation from orbit. Camera height is about 2km (camera height in the previous render is 670km). Thought I'd post it here to give it a bit more perspective with the detail in the original.
There are only two main surfaces in this (and a crude snow), but at this camera height I should be able to make a fairly convincing looking scene with the other surfaces and some added detail. Going any lower will require a lot more work but I'll try and get this level of detail done first.