Refine the line

After the basic shapes and lines are traced, I turn off the doodle layer (Layers > uncheck box). To keep some of the life and spontaneity, I like to use just one layer as I refine the drawing, erasing and adding lines. Tip: Some artists like to reduce the opacity of the sketch layer, create a new layer above and refine with a tighter version – sometimes repeating the process a couple times.