Simple Hand-Drawn Koala Mascot

Create a simple centered children's-book illustration of a cute full-body koala character on a plain white background. The koala has soft {argument name="fur color" default="warm gray"} textured fur with a rough crayon or felt-tip marker fill, thick irregular black hand-drawn outlines, a large rounded head, two oversized round ears, and a small upright oval body. Use exactly two ears, each with one solid black inner ear patch; no pink inner-ear lines. The face has exactly two round white eyes with black circular pupils, one large vertical oval black nose in the center, and one small curved smiling mouth below it. The arms hang down at the sides with rounded mitten-like paws, and the short legs end in small three-toed feet. Keep the style naive, flat, slightly wobbly, and hand-drawn, like a child-friendly mascot sticker; no shadows, no scenery, no text, no accessories, no extra characters.