The Gospels
Images of the peasant preacher were what was left by the Gospels, they did not discuss much physicality or features but these images arose after his death and with the spread of Christianity. The Gospels barely discussed anything regarding his appearance but rather the focus was on character, stories about him, and church scripture. The truth behind this is that if his disciples had known maybe there would be better imagery available.
Eusebius Of Caesarea
An early tradition that was recorded by Eusebius of Caesarea portrayed that Jesus washed his face and upon drying it he left the picture of his face on the towel he used. This was then passed on to King Abgarus of Edessa who wanted Jesus to heal him. The picture is now referred o as the Image of Edessa and many copies of it remain being passed around, however, these were not made using human touch.