This colored pencil style has varying width outlines, and could also look like a coloring book style that has already been colored in. It also reminds me of the outline style in art nouveau. The subjects tend to be cartoony. This version of the style has a bias toward outdoor scenes with blue skies and clouds, but is easy to get around if you prompt for something else. The trigger is n0vuschr0ma style. Prompting for colored pencil isn't always necessary, but can help depending on what you're going for.