Graffiti Sketch AI Creator

Presented in a graffiti sketch style [{argument name="subject" default="A Powerful AI Builder"}], the overall visual effect is rapid sketching, free transformation, improvisational hand-drawing, and draft-like effects. The lines are casual, exaggerated, and vary in thickness, appearing somewhat messy but possessing rhythm and expressiveness, emphasizing summarization, exaggeration, playfulness, and spontaneity rather than rigorous realism or meticulous portrayal. The color uses rough, dry-brushed textured surfaces to retain uneven smears, brush marks, whitening, and coverage. Colors automatically adapt based on [{argument name="theme" default="A Powerful AI Builder"}], but overall maintain doodle, sketch-like, and generalized expression. Avoid transparent watercolor blending, don't use delicate watercolor transitions, don't use paper textures, don't softly mist, don't have dreamy textures. The background should mainly use blank space, maintaining simplicity, ease, unfinished design, and a sense of design. You can add a few auxiliary symbols, arrows, marks, circles, repeated lines, casual writing, or other doodle elements to enhance the visual language of a sketchbook or essay, but it should not be too crowded or disrupt the main subject and the quality of the blank space. The content does not need to be written clearly in advance; it is automatically deduced and generated by [{argument name="Main Subject" default="A Powerful AI Builder"}] to generate the most suitable subject image, actions, related elements, symbols, or simplified scenes, maintaining a unified graffiti sketching style and exaggerated and summarized expression, avoiding complex realistic backgrounds and excessive elaboration. The image should naturally include a unique signature "BlanPlan" as part of the image. The position should be low-key but clear, suitable for the lower left corner, lower right corner, or near the title. The style should be consistent with the overall layout, such as the artwork's signature or design signature; The signature font should be exquisite, restrained, and sophisticated; it should not be too large, must not disrupt the main composition, and should not appear abrupt or cheap.