lines made with a brush. modern black paint brush spots, highlighter lines or felt-tip pen lines. abstract stains

brush brushstroke paintbrush blob ink set smear paint smudge splatter abstract acrylic aquarelle art background black border dash blotting decoration decorative design dirty dripped stroke handdrawn shape symbol line isolated watercolor illustration modern dye pen pattern graphic marker stain graffiti grunge drip drawing spot texture horizontal ai generated