An artist friend of mine decided to suggest one little trick when creating a primary sketch. Usually at this stage it takes me a lot of time, because in fact I need to try to translate all my images into reality. Before that, I drew hundreds of lines, one on top of the other, until I get what I roughly want. However, she advised to create the initial sketch with spots, starting with huge strokes and then gradually detailing them with smaller and smaller brush strokes.