Locating someone using only their picture involves using a reverse image search tool. There are various websites that offer this service, such as Google, TinEye, and PimEyes. These tools allow you to upload a picture or paste the URL of the image you want to search for. The search engine then looks for similar or identical images online, which can lead you to the person's social media profiles, online accounts, or other websites where their picture is posted.
It's important to note that while reverse image search can be a useful tool for finding someone, it's not always foolproof. The person may have used a fake profile picture or their picture may have been used by someone else. Additionally, the person may have limited their online presence, making it difficult to locate them through a reverse image search. Therefore, it's always a good idea to use multiple methods to locate someone, including traditional methods such as asking mutual friends or conducting a background check.