As part of the "Bay Area Figurative School" of artists, Parks broke out of the abstract styles around him and began to explore figurative paintings. When you see his work, notice the large size and large brush marks of his work. Those are thick paintings!!!
Even without detail, or because of the lack of detail, his work has a massiveness to it- almost like the primitive sculptures of Africa or Easter Island.
See more of his work at this link...
* also notice his wonderful use of color to make depth and the illusion of light.