Those claiming that there is no physical description of Jesus and the length and style of his hair are misinformed. The following is a description of Jesus written by Publius Lentullus, the President of Judea at the time of Jesus. You can find more information at the link below.
The following was taken from a manuscript in the possession of Lord Kelly, and in his library, and was copied from an original letter of Publius Lentullus at Rome. It being the usual custom of Roman Governors to advertise the Senate and people of such material things as happened in their provinces in the days of Tiberius Caesar, Publius Lentullus, President of Judea, wrote the following epistle to the Senate concerning the Nazarene called Jesus.
......his hair of (the colour of) the chestnut, full ripe, plain to His ears, whence downwards it is more orient and curling and wavering about His shoulders. In the midst of His head is a seam or partition in His hair, after the manner of the Nazarenes.
Sounds to me like the artists have it right!