On the left is a Limited Edition print. In this case, one of the Yosemite prints from 2015, of which 500 were printed.
On the right is an Artist Proof. In this case, one of the Yosemite prints from 2015, of which there are only 25 Artist Proofs available.
Artist Proofs are 13″ x 20″ and Limited Edition Prints are 13″ x 19″. When framed (approximately 18″ x 24″), prints should be mounted on acid-free foam core, with archival quality double mats, and heavy-duty UV resistant acrylic glazing. Each print or proof is numbered, dated and signed by the artist.