Thumbnail sketches are good for figuring out the composition, values, and problematic areas.

Viaduct sketch
   • Viaducts are Difficult to Draw  

Small sketchbooks
   • Advantages of Using a Small Sketchbook  

Ho Chi Minh City sketch
   • Ho Chi Minh City Cityscape Sketch (Ti...  

Notre Dame of Saigon sketch
   • Notre-Dame Cathedral Basilica of Saig...  

More tutorials
http://bit.ly/art-tutorial

Reference photos
https://photos.app.goo.gl/uXciqxMK2SD...

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