Is there an NFT Royalty Standard on NFTs for secondary market sales?

The Beautiful Paintings implement a royalty of 5% of the sale price by using EIP-2981. This allows marketplaces to obtain information about the royalty from the token contracts. The only marketplaces that you cannot currently trade your NFT on are LooksRare, SudoSwap and NFTX, since we only support marketplaces that honour royalties.