Original Cartoon Character Coloring Sheet

Create an original clean cartoon line art image for Northstar AI featuring three original neighborhood characters sharing a playful street scene. Objective: Create a printable character coloring page with a complete visual story. Composition: Three large figures, one simple setting and broad closed shapes with a clear foreground and background. Lighting and material treatment: Pure black line work on a clean white ground with uniform contrast and no tonal shading. Typography: do not include any words, letters, numbers or signatures. Use a deliberate hierarchy, clean edges, realistic shadows where appropriate, and enough negative space for editorial reuse. Output a polished 4:5 vertical composition unless the user specifies another ratio. Required constraints: Use original characters only; black lines on white; no gray fills, logos or copyrighted costumes. Do not add watermarks, fake certifications, unreadable filler text, duplicated objects, distorted anatomy, or unrequested logos. Preserve any uploaded product, person, or interface as the identity reference rather than redesigning it.