That's right. Of course - We “know” what he looked like
We do not notice this omission of any description of Jesus, because we “know” what he looked like thanks to all the images we have. But the Jesus we recognise so easily is the result of cultural history. The early depictions of Jesus that set the template for the way he continues to be depicted today were based on the image of an enthroned emperor and influenced by presentations of pagan gods. The long hair and beard are imported specifically from the iconography of the Graeco-Roman world. Some of the oldest surviving depictions of Jesus portray him as essentially a younger version of Jupiter, Neptune or Serapis. As time went on the halo from the sun god Apollo was added to Jesus’s head to show his heavenly nature. In early Christian art, he often had the big, curly hair of Dionysus. https://www.irishtimes.com/culture/books/what-did-jesus-really-look-like-as-a-jew-in-1st-century-judaea-1.3385334
Even that link didn't include that Jesus likeness.
The fact that headshot has not been widely circulated even now is further evidence the search for the truth, in some areas, doesn't even go skin deep.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”