Question: Lupin's appearance

[anavenc]

No: HPFGUIDX 33231

 Thinking about Lupin:

We don't know how he looks, apart from weariness, old robes and 
prematurely graying hair. He is the only main character about whose, 
say, facial features  JKR writes nothing. 
We know a lot about appearance of others, especially Dumbledore and 
Snape, whose looks are described to the smallest detail.
Why not Lupin? 

Yes, I've consulted Lexicon.

Any thoughts?

Ana.