I really like the style of your drawing, it looks quite beautiful, the color palette is well chosen. The city seems to be very interestingly situated, although I have to say that without your description it would have been hard for me to distinguish different features and actually "see" the city (the white on white is a bit confusing^^), fortunately for me your "tour" is a great help and "compliments" the picture perfectly. I gather from what you've written that it is still a work in progress, so maybe when you finish it it will be easier to "understand" the drawing.

Anyway, great work so far. I'm looking forward to the top-down view.