If you want to view your NFTs on Metamask, you need to navigate to the NFT section of your wallet by swiping right. Note that NFTs may not be displayed in your wallet automatically after purchase. In some rare cases, you will need to import the ERC-721 token contract address into your Metamask NFT wallet to view your collectible. This can be found on the Collections page for the NFT you purchased. Or by following the Transaction ID on your receipts.  Once imported, your NFT should appear in your NFT wallet section.