Okay, So I am a bit late to the party. I have recently got my hand on the tutorials from Eytan Zana's Advanced Sketching with 3D. This truly is a treasure trove of knowledge. Here I have tried some grey-scale comps to ideate on my recent personal project based on Indo-islamic Mughal architecture from India. I have applied some of the learning from Zana's tuts. Hope these makes sense. Will try to push few more comps in fully rendered scene. Stay tuned... :)