When I was young, I learned how to start pencil drawings by drawing perspective. My teacher had me put my shoe on the table and try to recreate it. As an adult, I had a teacher show me how to do block drawing by measuring out pressboard one inch at a time. I then learned to re-create what I saw just within this block.
Doing murals, I use the same technique. I don’t have to do lines. I take the photo of what I want to create and put points in it. I think put those points on the mural canvas and begin to draft out the drawing. Building my content on my facebook page, has helped me be forward thinking in what projects I will create next.
It is tried and true.