Create a cartoon face inspired by the first reference image of Billie Eilish, focusing only on the face with no neck or body. Render it in the style of the second reference image, which is the Irasutoya style. Use soft colors, round features, and a gentle expression. Include Billie Eilish's signature neon green and black hair. The style should reflect the simple, clean, and friendly look of Irasutoya illustrations.image