以涂鸦速写风格表现 {argument name="subject" default="a powerful AI builder"}，整体呈现快速勾线、自由变形、即兴手绘与草稿式速写的视觉效果。线条随性、夸张、粗细不一，略显凌乱但富有节奏和表现力，强调概括、夸张、趣味与自发性，而非严谨写实或精细刻画。色彩以粗略色块呈现，带有鲜明的干刷感，保留不均匀的涂抹、笔触、飞白与叠色层次。色彩自动适配 {argument name="theme" default="powerful AI builder"}，但整体表现始终保持涂鸦感、速写感和概括性。不要透明水彩晕染效果，不要细腻的水彩过渡，不要纸张纹理，不要柔雾效果，也不要梦幻质感。背景以留白为主，保持简洁、轻松、未完成感和设计感。可以添加少量辅助符号、箭头、标记、圆圈、重复线条、手写文字或其他涂鸦元素，增强速写本或随笔式的视觉语言，但不得过于拥挤，也不能破坏主体与留白氛围。画面内容无需预先写定；{argument name="character image" default="a powerful AI builder"} 将自动推导并生成最合适的主体形象、动作、相关元素、符号或简化场景。整体始终保持统一的涂鸦速写风格，以及夸张、概括的表现方式，避免复杂的写实背景与过多细节。应将专属签名 'BlanPlan' 自然地作为画面的一部分加入，置于低调但清晰的位置，例如左下角、右下角或标题附近。签名风格应与整体排版统一，如艺术家的签名或设计标记；签名字体应精致、克制、有高级感，不能太大，不得破坏主体构图，也不能显得突兀或廉价。

Express {argument name="subject" default="a powerful AI builder"} in a graffiti sketch style, presenting an overall visual effect of quick outlines, free deformation, improvised hand-drawing, and draft-like sketches. The lines are casual, exaggerated, varying in thickness, and slightly messy but rhythmic and expressive, emphasizing generalization, exaggeration, fun, and spontaneity rather than rigorous realism or fine detail. The colors are expressed in rough blocks with a distinct dry-brush feel, retaining uneven smears, brush marks, fly-white, and layering. Colors automatically adapt to the {argument name="theme" default="powerful AI builder"}, but the overall expression remains graffiti-like, sketch-like, and generalized. No transparent watercolor smudging effects, no delicate watercolor transitions, no paper textures, no soft atomization, and no dreamy textures. The background is mainly white space, maintaining a sense of simplicity, ease, unfinishedness, and design. Small amounts of auxiliary symbols, arrows, marks, circles, repeated lines, handwritten text, or other graffiti elements can be added to enhance the sketchbook or essay-like visual language, but they should not be too crowded or destroy the subject and the white space atmosphere. The content of the picture does not need to be written in advance; {argument name="character image" default="a powerful AI builder"} will automatically deduce and generate the most suitable main image, actions, related elements, symbols, or simplified scenes. The overall style remains a unified graffiti sketch style and an exaggerated, generalized expression, avoiding complex realistic backgrounds and excessive detail. A special signature 'BlanPlan' should be naturally added as part of the picture, in a low-key but clear position such as the bottom left, bottom right, or near the title. The style should be unified with the overall layout, like an artist's signature or a design mark; the signature font should be exquisite, restrained, and high-end, not too large, and should not destroy the main composition or appear abrupt or cheap.