I don't know if you'd enjoy some BG plants, but when i need to draw a scene, i created the base of the drawings as my examples right here.
So, i can use it when i'm drawing my Manga before.
After this phase, i usually go crazy with 3D basis and 2D details later, and i try to fix a few blocks from doors or windows.
Just to make sure they still alright too. ~ /o/