Isaiah 53:2b “He has no stately form or majesty that we should look upon Him, nor appearance that we should be attracted to Him.”
I don’t think I will even begin to point out that without a photo, we have next to no idea what Jesus looked like.
However, if (and this is a big IF) ... if the Shroud actually is the wrapping cloth of Jesus' mortal remains, then it is not a human portrait: it is an image not made by hands.
The fact that the Sinai picture maps accurately onto the Shroud image does not provide definitive proof, but still it is a tantalizing piece of evidence that the two portrayals --- one made by an artist's hand, the other made by the mysterious imprint of a body marred by blood, serum, dirt and sweat --- may be of the same Person.