oil hand drawn painting stylization. background with colorful rainbow textural line from paint on white backdrop. ai generated.

rainbow iridescent manynoloured colored colorful line template multi multicolor bright vibrant vivid transition gradient white oil acrylic gouache painting paint abstract 3d brush stroke brushstroke paintbrush putty knife draw drawn drawing painted art artwork artistic digital picturesque painterly background texture textural canvas backdrop illustration image color colour modern imitation creative