I was watching a documentary about relics of the crucifixion earlier today. I had never seen the original "veil of veronica" before but as soon as I did it looked rather familiar.
Have a look at the face on the veil and the face of the Mona Lisa, especially the long nose, position of the lips and the alignment of the eyes.
I have no idea what this similarity means. It could be as simple as them both following the same artistic idea about what constitutes beautiful proportions for a face.
Feel free to leave a comment.