Graffiti Sketch AI Builder Style

Render [{argument name="subject" default="an awesome AI builder"}] in a doodle/sketch style, with an overall look of quick outlines, free-form deformation, improvised hand-drawing, and a draft-like visual effect. The lines should be casual, exaggerated, and varying in thickness, slightly messy but rhythmic and expressive, emphasizing simplification, exaggeration, fun, and spontaneity rather than strict realism or fine detail. Colors should be rendered as rough blocks with an obvious dry-brush feel, retaining uneven smears, brush marks, dry-brush streaks, and a layered-over look; the colors should automatically adapt to the [theme/subject], while the overall expression stays doodle-like, sketch-like, and simplified. Do not use transparent watercolor bleeding effects, do not use delicate watercolor gradients, no paper texture, no soft blur, no dreamy quality. The background should be mostly negative space, kept simple, relaxed, with an unfinished, designed feel; a small number of supporting symbols, arrows, marks, circled areas, repeated lines, casually handwritten text, or other doodle elements may be added to strengthen the sketchbook or notebook-style visual language, but it must not become too crowded or disrupt the subject and the sense of empty space. The content of the image doesn't need to be spelled out in advance — let [{argument name="subject" default="an awesome AI builder"}] automatically determine and generate the most fitting subject, pose, related elements, symbols, or simplified scene, while keeping a unified doodle/sketch style and exaggerated, simplified expression throughout, avoiding complex realistic backgrounds and over-elaboration. A signature reading "{argument name="signature" default="BlanPlan"}" should be naturally included as part of the image, placed unobtrusively but legibly — in the bottom left, bottom right, or near the title — in a style consistent with the overall layout, like an artist's signature or a designer's mark; the signature's typeface should be refined, restrained, and elegant, not too large, and must not disrupt the subject's composition or look out of place or cheap.