http://zqktlwk5ilgohy63eyrptyb4mc76bunfmxcnstkmveyjnskxkpq3b5yd.onion/wiki/Web_Related_Leakage
Usually, this image will be located on a server that the sender controls, which means they will then have your IP address once your browser makes the connection. Of course, for normal images, these will obey your proxy settings. However, note that even using Tor is sometimes insufficient . Make sure your proxy settings have an entry for FTP, especially.