A discussion about art and neuroscience is incomplete without Santiago Ramon y Cajal, whose stunning ink drawings of neurons form the foundation of neuroanatomy. (See DISCOVER's earlier slideshow on Ramon y Cajal's life and work.) Cajal trained as an artist but made his fame as a neuroscientist, winning a Nobel Prize in 1906.
Dunn cites Ramon y Cajal as an inspiration, and his painting of Purkinje cells--large branching neurons in the cerebellum--evokes his predecessor's ink drawings of the same.
To see more of Dunn's work and buy some of it for yourself (with a discount for grad students!), head over to his website.