Create an easy Christmas coloring line-art illustration for young children featuring scene: Decorating the Christmas Tree. Treat the scene description as a literal visual requirement. Every specific character, object, setting, or activity named in Decorating the Christmas Tree must be clearly visible and easy to recognize. These scene-defining elements are the main focal points of the illustration and should be shown prominently. The stars of every scene are a small trio of adorable Christmas friends: a playful little penguin wearing a simple striped scarf, a friendly round-bodied reindeer with soft simple antlers and a small round nose, and a cute smiling snowman with stick arms and a tiny hat. Include at least two of these three friends in every scene, drawn large and expressive as the main characters, with clearly happy faces so every scene reads as warm and cozy. At most one classic Christmas character, such as Santa Claus, an elf, or a gingerbread person, may appear in a supporting role, kept smaller and secondary to the trio, or may be omitted entirely. Simple Christmas accents such as a moon, stars, large simple snowflakes, a fence, pine trees, a wreath, or a single small wrapped present may complete the scene; outside the scene "Wrapping Presents Together," keep wrapped presents small and secondary. For the scene "Decorating the Christmas Tree," show one large simple Christmas tree with a character hanging a single big round ornament while the others hold more ornaments ready. For the scene "Sledding Down the Snowy Hill," show one or two characters on a simple wooden sled mid-slide down a gentle hill while another cheers from the top. For the scene "Ice Skating on the Frozen Pond," show a big open oval pond with one character gliding happily on skates and the others watching or wobbling at the edge. For the scene "Cookies and Cocoa by the Fireplace," show a small cozy fireplace with a contained fire, a plate of large simple cookies, and big steaming mugs the characters hold. For the scene "Hanging the Stockings," show a fireplace mantel with two or three large, completely plain stockings being hung by the characters. For the scene "Christmas Caroling in the Snow," show the trio in a row with heads tilted up, mouths open mid-song, a few simple music notes in the air, and one character holding a small lantern. For the scene "Sleigh Ride Under the Stars," show the reindeer playfully pulling a simple wooden sleigh carrying the other characters across the snow. Keep the scene simple, spacious, and easy for young children to color, using only a few large, clearly separated elements, broad open coloring areas, generous white space, and minimal detail. Present the line artwork itself directly as the image: a flat, straight-on digital illustration filling the canvas, with the canvas edges themselves forming the outer limits of the artwork. Use only black outlines on a pure white background, and keep every enclosed shape completely unfilled with a bright white interior. Every visible element, including lights, windows, ornaments, presents, decorations, trees, wreaths, stockings, snowflakes, and hair, is rendered as crisp black outline line art with bright white interiors, so the entire illustration reads as a pure black-and-white line-art image. Create a true edge-to-edge composition: a few large scene elements may naturally continue beyond and be cropped by the four canvas edges, while the main characters and main activity remain clearly visible within the canvas, leaving the canvas edges visually open rather than enclosed. Keep all potentially writable surfaces plain and unmarked; communicate everything entirely through characters, objects, poses, and actions. The finished artwork contains only pictorial black linework and white coloring space.