“SCENE_ACTIVITY = [Witch's Potion Brewing Lesson | Giant Cauldron Stir | Potion Bottle Shop | Gathering Magic Ingredients | Potion Taste Test Party | Floating Potion Surprise | Cauldron Bubble Bath | Potion Mixing Contest] Create an easy Halloween coloring line-art illustration for young children featuring scene: {SCENE_ACTIVITY}. Treat the scene description as a literal visual requirement. Every specific character, object, setting, or activity named in {SCENE_ACTIVITY} 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. Every scene must prominently feature witches'-brew imagery: a large bubbling cauldron, potion bottles, or both, drawn big and central so they are unmistakably the heart of the scene. A friendly witch should appear in every scene as the natural host of the activity. Around her, use a small cast of 4 to 5 friendly Halloween characters total, selected from ghosts, vampires, witches, mummies, zombies, werewolves, Frankenstein-style monsters, skeletons, and other classic Halloween creatures. Use each character type at most once. Choose only the characters that naturally fit the activity rather than trying to include every monster type. The witch may occasionally ride or fly on a broom, or she may participate on the ground like the other characters. Carved pumpkins are optional. When present, depict either a single carved pumpkin or two carved pumpkins total, kept small and secondary within the scene. For the scene "Floating Potion Surprise," show one character gently and happily floating a short distance above the ground with a small open potion bottle nearby, so the cause is obvious. For the scene "Cauldron Bubble Bath," show large round bubbles rising from the cauldron and a relaxed, smiling character sitting inside it, with no fire beneath. For the scene "Potion Mixing Contest," show two clearly separated small cauldrons with one character at each, and a third character watching as the judge. 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, pumpkins, ghosts, decorations, trees, shrubs, bushes, bats, 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.”