Cooool, and you even took a request! For your last one maybe do a city, but like, R'lyeh, with no recognizable geometry!
I'm kidding of course. Your drawings are great. I really like the additions to the surroundings you've made, they really "ground" the pieces so to speak. I'm so excited to see what happens for your last one!
And if you attempt to draw a non-Euclidian city of madness I will never forgive myself for mentioning it.
cheers,
Meshon