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If we use face recognition technology on this basis so that everyone can only generate a unique account, will it be fairer, safer, and more energy efficient than current Bitcoin.
This sounds rude, but you clearly lack knowledge about technical aspect of Bitcoin.
1. Bitcoin doesn't have account.
2. How does this technology prevent usage of stock image (e.g. Shutterstock), stolen image (e.g. from Facebook profile page) or AI generated example (e.g.
https://thispersondoesnotexist.xyz/)?
3. How do you implement your idea on decentralized manner?
I strongly recommend you take some time to learn some technical aspect of Bitcoin from
https://learnmeabitcoin.com/ and
https://github.com/bitcoinbook/bitcoinbook.