Sketchcrawl on Interstate

I started out doing a large chunk of the firehouse from a bit of a distance behind it.

And then wandered around till I was near the front, and noticed one tiny plant clinging to a toehold on a window sill.

And finally, I tried a small chunk of the water tower behind the firehouse, blocking in the forms and shading.  But the sun kept wandering in and out of the clouds, and the shadows kept changing.