And it's a really lovely thing, you've drawn there
One little nitpick if I may: I noticed that the towers and walls cast equally long shadows, wich is fine of course, if they actually are equally tall. But the shadows cast by the towers are darker than those of the walls, which I think suggests that they are not.
Other than that: kudos!
"The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'"- Isaac Asimov
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