This is a link to a slideshow of Northern California artist Robert Frank's plein air paintings. None are larger than 12"x16," and many are only 6"x8."
He graduated from the Rhode Island School of Design with a degree in architecture and subsequently worked as an architectural illustrator. In 2005, he saw an exhibit of nationally known plein air painters and was inspired to take oil painting classes the Academy of Art University in downtown San Francisco. He now teaches there himself. He has also taken painting workshops with Armand Cabrera, Timothy Horn and Randall Sexton.