Graphic design should not be treated as an illustration since these are two different designing styles. Their design projects range from both product and graphic design with many impressive examples.
Westminster Andrew Voss Design Fashion Illustrations Fashion 
image source https://www.pinterest.com/pin/208995238933735290/ Figure Businessman With Portfolio Avatar Silhouette Stock Vector 
image source https://www.dreamstime.com/figure-businessman-portfolio-avatar-silhouette-figure-businessman-portfolio-avatar-silhouette-vector-illustration-design-image116717377 Decorative Elements Web Design Portfolio Template Illustration 
image source https://www.dreamstime.com/stock-illustration-decorative-elements-web-design-portfolio-template-illustration-image87520432
Illustration designer commissioned and speculative work for flyer poster card advertising menu catalogue editorial web graphics packaging visual identity.
