A vintage 1950s-style illustration of a determined detective with a magnifying glass meticulously examining an enormous sprawling blueprint covered in intricate mechanical diagrams and circuit-like patterns, the blueprint spread across a wooden desk in a warmly lit study, dust particles floating in golden afternoon light streaming through venetian blinds, the detective wearing a tweed jacket and bow tie, surrounded by stacks of technical manuals and reference books, a brass desk lamp casting dramatic shadows, the mood suggesting careful investigation and the satisfaction of catching hidden flaws before they become problems, muted sepia tones with pops of deep burgundy and forest green, rendered in mid-century advertising illustration style with visible brush textures and halftone dots.