Here are some steps you can follow to create vintage style illustrations:
Study vintage art and design: Research vintage art and design styles from the past, such as Art Deco, Art Nouveau, and the Victorian era. Look at the colors, patterns, and motifs used in these styles to get a feel for the vintage aesthetic.
Use traditional tools: Consider using traditional illustration tools such as pencils, ink, and watercolor. These mediums can help you achieve a more authentic vintage feel.
Incorporate vintage elements: Use vintage-style typography, borders, and frames in your illustrations. You can also incorporate elements such as steam trains, vintage cars, and old-fashioned phones.
Experiment with texture: Use techniques such as stippling, cross-hatching, and dry-brush to add texture to your illustrations. This will give your illustrations a hand-drawn, vintage feel.
Use muted colors: Vintage illustrations often have a muted color palette, so consider using soft blues, greens, browns, and grays in your illustrations.
Add a touch of nostalgia: You can evoke a sense of nostalgia in your vintage illustrations by including elements such as old postcards, photographs, and handwritten letters.
Use distressed edges: Consider giving your illustrations a distressed edge by using techniques such as sanding or adding tea or coffee stains.
Remember, vintage style illustrations are not exact replicas of vintage artwork, but rather a modern interpretation of vintage design elements. Experiment with different techniques and styles to create illustrations that are uniquely your own.