Great to know I'm not the only one who often pauses, pen drawn and wondering if I really want to start down this line of rendering roads/walls/roofs one way or the other. That's what I use Photoshop's eraser tool for!

Looks like a grand start, and I love the way the rivers are drawn. It hadn't occurred to me that the gutter line might add to the sense of realism, but I think Lostatsea is right, there. Worry not, Jaxilon!