Appearance or looks or face?

[strange boy]

Are the following sentences correct?

A: I don't know your brother's name. I just know him by his looks.

B: I don't know your brother's name. I just know him by his face.

C: I don't know your brother's name. I just know him by his appearance.

Thanks in advance.

 

[Johnyxxx]

I know him by sight should work.

 

[teechar]

I don't know your brother's name. I just know him by sight.

 

[strange boy]

Do you mean that the three sentences i made are incorrect?

 

[Rover_KE]

Do you mean that the three sentences I made are incorrect?

Yes.

Always capitalise 'I'.

 

[tzfujimino]

May I ask a question?

How about "I recognize him by (his) appearance"?

Is it unnatural?

Thank you.

 

[MikeNewYork]

Yes, it is.

 

[emsr2d2]

I'd accept "I don't know his name but I know his face" or "I don't know his name but I would recognise him if I saw him".

 

[Johnyxxx]

I'd accept "I don't know his name but I know his face" or "I don't know his name but I would recognise him if I saw him".

May I use the idiom ring a bell (with me)?

His face rings a bell (with me).

 

[teechar]

That has a different meaning.
It means: He face appears familiar to me/I may have met him before.

 

[Rover_KE]

His face rings a bell.

No — but we do say 'That name rings a bell'.

I'm longing to be introduced to somebody called 'Clapper'.