Graffiti Sketch Style Powerful AI Builder

Graffiti sketch style illustration of a powerful AI builder, featuring quick loose outlines, free exaggerated deformation, improvised hand-drawn draft-like visual effect. Lines are casual, varied in thickness, slightly messy but rhythmic and highly expressive, prioritizing playful generalization, exaggeration, fun and spontaneity over strict realism or fine intricate details. Colors are rendered as rough solid blocks with distinct dry-brush texture, retaining visible uneven smears, raw brush marks, fly-white gaps, and natural layering, color palette is automatically adapted to the powerful AI builder theme while fully keeping the rough graffiti sketch generalized aesthetic. Forbidden effects: no transparent watercolor smudging, no soft watercolor color transitions, no visible paper textures, no soft atomization effects, no dreamy hazy textures. Background is predominantly plain white negative space, maintaining a simple, casual, unfinished design draft feel. Add a small number of sparse auxiliary graffiti elements: subtle arrows, tiny circles, faint repeated line marks, minimal handwritten tech-related short text, do not overcrowd the frame or disrupt the subject and white space atmosphere. The AI builder is depicted in dynamic, fitting action (such as holding a glowing digital construction tool, surrounded by minimal simplified floating code or building block elements), no complex realistic backgrounds, all secondary elements follow the unified exaggerated generalized graffiti sketch style. Add a small, low-key but clear signature reading 'LumenMark' naturally integrated into the frame, placed at the bottom left, bottom right corner, or near any small handwritten title element, signature uses a refined, restrained, high-end font matching the overall style, small size that does not disrupt the main composition or appear abrupt or cheap.