Hey, great job! I really loved this course. Overall I think you did pretty good on your assignments, but I think this was perhaps your weakest assignment:
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In all of your examples, I don't feel you've really given the viewer anything in particular to look at. You have the options of using one or any combo of color, value, texture, or detail, but you haven't really taking advantage of that. You've colored some items, and spread them evenly throughout the piece. You come closest in the upper right panel- my focus goes to the telescope there, but the focus still feels at bit all over the place. Just my 2 cents. 
It looks like you put in a ton of work and I love how spooky you went with the final. Great job! 