STEP 8: Gel pens work well to add tiny shimmery details against the broader strokes. Unify your work by repeating certain elements and ways of creating or executing it. Repetition gives rhythm to a piece, which helps to create harmony. Lightly seal the work with a spray varnish when you are finished, to protect it which also helps the more delicate areas to stay in place. If you worked on watercolor paper, you wonâ€™t have to do this.