Penn is an illustrator / artist who has exhibited and published widely on natural history themes. Her unique pen & ink drawings have been used in books, educational and interpretive materials all over the province. Her watercolour mandalas are in both public installations and private collections.

A pioneer of 'community mapping', Penn has created numerous artistic community maps that have been published across North America and Europe. She has developed exhibits and signage for many parks and museums. Her sketch journals have appeared in a variety of publications.