Hi!
I draw with watercolor. I take a light paint and map out the silhouette of the top burger roll. Below it, I paint tomatoes, lettuce leaves, a beef with cheese and a loaf on which the whole structure is lying.
See a video of how it was!
This is my entry for 
https://steemit.com/artstorm/@deemarshall/artstorm-contest-18-day-2-theme-today-fast-food
It's Non-digital Art!
Cheers, Ama!