Day 14 - Drawing bonus exercise from lesson 7

So the bonus challenge was to draw nine storey building not just copy something from the book.
Here is my version of the structure.

The shadows are notably bad , but I hope the forms are ok. Anyway it took about an hour again.
So I think this is optimal time period for my drawing session.
Lesson eight is tomorrow!
I've peeked a little bit and not very happy with the content. It is simple, I'm just not sure that I can render the texture correctly. But we will see!