I have studied the Shroud for over 40 years.
Perhaps if you read the many books and studies or corresponded with any of original scientists of the 1978 group, you would have picked up the fact the forensic scientists determined that the man of the shroud suffered from a broken nose and swollen cheek from trauma...that resulted in swelling and a 'bump" = "oh my!"
There were hundreds of icons painted in the early years, (no photography to easily reproduce) for churches and private chapels - most using the Shroud face as the model. The Shroud face is, it would seem, the origin of the physical description of what Jesus looked like that we all instantly recognize...
Frankly, I thought the bumpy nose made him look Jewish. (*sheepish grin*)