From experience, here is what I have felt.
It all starts with your energetic frequency. You feel like you share the same energetic vibration. You feel an energetic oneness. You feel like you are your Twin Flame. It is not very easy to explain to anyone who has not met a Twin Flame. Your first encounter confirms this — it feels like you have been eternal best friends without knowing it. The uncanny familiarity leaves you in awe. You keep wondering how you have known a stranger all your life.

Secondly, if you have truly met a Twin Flame, you do not have to have physical similarities. Some Twin Flames come from completely different worlds. You are sometimes raised from different cultural and religious backgrounds. You might be both raised and live on different continents. etc. But, that being said, you find yourselves saying the same things at the same time. You beat each other to complete sentences. It feels like you live inside each other’s minds. It is very mind-boggling when this happens.
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On the physical plane, some of the similarities that I have with my Twin Flame are very profound. We both love the color blue. Sometimes we could have matching outfits without discussing it. We like the same kinds of food. We do things together that only we enjoy. Etc.
As simple as that sounds, Twin Flame love is effortless, natural, and a soul connection from the Source.
Stay Blessed