We artist are not really compensated from working on a set of regular sketch cards so the card company gives ARTIST RETURNS or ARTIST PROOF cards and have the artist sell their own sketch card and these are actually exclusive. It is kind of a reward or incentive for the artist who made the artwork.
The artist can decide if he wish to keep the AP card as a collection or to sell it others.
The value of AP cards differs from regular sketch cards found in the box sets and can be higher. Price can base on artist decision, the character, and complexity of the artwork.
The license company need to approve the AP sketch cards. It takes weeks or up to months to get an APPROVAL. If you happen to commission an artist to draw on the Artist Proof from scratch with please allow weeks to months for approval and shipment delivery.
Artist Proof sketch cards (AP) are not in the set distribution. They are owned by the Artist and it’s more RARE than regular sketch cards because they are not inserted in the trading cards.
The convenience of the AP cards from the regular sketch card is that you don’t need to buy an entire box set to find the artist. You just need to find the Artist.
You can buy directly to the artist and have the artist draw character you wanted for.
In my case I have a page where you can commission me an Artist Proof Card card in this page . You can ask me what character to draw and pose. Be sure to read the Guidelines to avoid rejection from MARVEL.
Artist Proof sketch cards made with freedom of time. Performing higher quality than of making the regular sketch card is a good practice for the artist.