Create a vintage-style illustration of a cityscape enveloped in fog, reminiscent of early 20th-century postcards. The scene should feature classic architecture with ornate details, such as brick buildings and wrought-iron balconies, partially obscured by a soft layer of fog. Include vintage street elements like lampposts and classic cars parked along the cobblestone streets, enhancing the nostalgic atmosphere. The color palette should consist of muted tones, with a warm, diffused glow suggesting early morning light. A subtle grainy texture should be applied to evoke the feel of an old photograph, inviting viewers to step back in time and experience the charm of a foggy urban landscape.