These are by artists Jim Dine and Judy Pfaff.
Dine is often called a "pop artist". Pop art uses images from popular culture in the work. I don't always see this in Dine's work (is a heart part of pop culture) but he certainly comes for the era and has similar style to other pop artists.
Pfaff is most known as an installation artist but she also does large scale woodblock prints like the two below. She is also a painter and a sculptor. A few years ago she was the subject of a career retrospective exhibit at New York's Ameringer/McEnery/Yohe Gallery.