Another option is to use a screen recording from your smartphone. Start screen recording while viewing the full-size profile picture, then zoom in with your fingers. This allows you to zoom in on the profile picture while taking the shot.

Another method is to download the profile picture and then open it in an image editing application. This allows you to enlarge the profile picture and see the details in more detail.

If you're still having trouble zooming in on a profile picture, you can also contact the user directly and politely ask for a larger version of their profile picture. Many users are willing to share a larger version of their profile picture if you politely ask.