Yet another update for you guys:

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You'll notice I redid the drop shading for the entire thing. Turns out I hadn't really understood the "dimensionality" of incoming sunlight in that first try, so I scrapped it and began anew, with two more starbursts to indicate (1) the height of the sun and (2) the position on the horizon directly beneath the sun. With those two, I could easily work out where each corner would throw its shade and then fill in the blanks.

I also added some darker hues to the sea and did some more shading to the background. Nowhere near finished yet, but there's progress!