Hi all,
I feel like any DM or aspiring fantasy mapmaker should check out Angry's article on mapping Vancia (a city from one of his campaigns). Although it doesn't cover much as far as drawing technique goes, it has information and links on the actual design process in making a fantasy city, including some official WoTC material from their archives.
These resources have been (and will be) extremely useful to me in mapping the cities of my world setting. I really hope other people benefit from it as much as I do.

http://theangrygm.com/mapping-vancia/

PS, I do have Angry's permission to link here (see: https://twitter.com/TheAngryGM/statu...72312179908608)