The number of likes you need before you make a sale depends on several factors, including the photos you sell, the price you charge, and your engagement on the platform. There is no fixed rule for the number of likes you need to achieve a sale, and it is important to remember that the number of likes is not the only factor that affects your sales.
Likes are an indicator of how engaging your content is and can help increase your visibility on the platform. But to increase your sales, you also need to have a good product or service quality, a clear message and a marketing strategy that takes into account the customers' needs and wants.
Instead of focusing solely on the number of likes, it can be more productive to look at your engagement as a whole. This includes the number of comments, shares, followers and conversion rate (how many of your followers actually buy your product or service).
So instead of focusing solely on the number of likes, you should work on building a loyal following and an engaging presence on the platform. This will help you build more trust and credibility, which in turn can increase your chances of making a sale.