Zoom makes it super easy to log in, and you don't even need an account to join someone's meeting. Assuming you clicked on the link to enter someone's meeting, you probably aren't logged in. If your profile picture isn't showing, you need to go to the Zoom app or a web browser, sign in, then join the meeting with the meeting ID (which should have been sent to you in the invite). Also, remember that Zoom meeting administrators have a lot of control over what you can do within the meeting. This means they may have turned the option to show profile pictures off within their meeting. If you're positive that you've logged into the correct account, this is likely the reason you aren't seeing your profile picture. To confirm, create your own meeting and see if your profile picture appears.