Which one do you think most advanced? Or, which one looks like beginners?
You have no idea who they are. You may not even dance Tango. But you can group them in "more advanced" and "less advanced", correct?
As you saw it in the photo, it does not matter how long they have danced or how much they've spent. Dancers can be judged by just a glance.
When we look at dancers, postures and lines are most critical.
It's a pattern recognition. Even with photos with blurry artistic effect, you can see it.
Dancers 1 and 2 show straighter, longer, and more defined lines. "Tilt" in the lines means that they have more interdependent balance, which makes them look more advanced.
There are social Tango dancers who proclaim how it looks does not matter.
Well, it does. There is an art in the dance. It's not all about how you feel.
Go beyond such a limiting belief and start working on your posture and lines, if you want to look good quickly.
After seeing that "looting in the chaos" tax vote, I feel like posting something pithy.