It's not possible to locate someone's Instagram account using only their picture. Instagram does not have a feature that allows users to search for others using an image. The only way to find someone on Instagram is by using their username or full name. You can try searching for the person's name in the search bar, but this may not yield accurate results if the person has a common name or if they have set their account to private. Additionally, even if you are able to locate the person's account using their name, they may not have their profile picture set, which means you won't be able to confirm that it's the correct account. Therefore, it's not possible to find someone's Instagram account using only their picture.