I have sold an nft that I have not yet created, I will show it to you soon

It turns out that I'm involved in some projects, among others, I decided to make my own nft and since I couldn't sell any of them, a friend of mine told him that he would buy me the first one that I make some designs for and he chooses it among some.... he wants the printed painting and the nft as such what do you think about it and today Wednesday I start to put together some designs so choose one