Whimsical pen & ink
These are fun and loose illustrations done in pen and ink. Color can be added. Due to the style, the end product is usually created as a hi-resolution jpeg versus illustrator vector art yet options can be discussed. See sample.
Fun graphic illustration
These illustrations are created as vector and project a bold graphic feel for impact.See sample.
There are many styles offered by as many illustrators. Frey Design can art direct and coordinate the illustrator search and communication from inception to completion of your particular project.