There is no Biblical support for the artist renderings of Christ having long hair. Instead, there is both historical and Biblical / scriptural support that He would have had short hair.
First, He was a carpenter by trade (Mark 6:3). Long hair would have been a danger in His work.
Second, Paul's statement in 1 Cor. 11:14-15 makes it clear that long hair on a man would be shameful:
"14 Doth not even nature itself teach you, that, if a man have long hair, it is a shame unto him?
15 But if a woman have long hair, it is a glory to her: for her hair is given her for a covering." (KJV)
Long hair was a glory to the woman, but on a man was effeminate.
Third, historical pictures of the first century show men having short hair.
Excerpt from the post "Did Jesus Have Long Hair?":
" History shows that short hair on men has been around for a long time—much longer than many realize. At the time Jesus lived, it was the accepted and general custom. For proof, all one need do is pick up any illustrated history book relating to the period. You will find pictures of busts and statues of famous Greeks and Romans of Christ’s time. In every case, the men are portrayed with short hair similar to what we find today." Source: here
The imagery and portrayal of Christ as having long hair and a beard comes out of pagan mythology of the Byzantine era during the 4th century that appears to put Christ above and in place of the pagan god Zeus.
Excerpt from a BBC article "What Did Jesus Really Look Like?" by Joan Taylor:
"In fact this familiar image of Jesus actually comes from the Byzantine era, from the 4th Century onwards, and Byzantine representations of Jesus were symbolic - they were all about meaning, not historical accuracy.
They were based on the image of an enthroned emperor, as we see in the altar mosaic of the Santa Pudenziana church in Rome. Jesus is dressed in a gold toga. He is the heavenly ruler of all the world, familiar from the famous statue of long-haired and bearded Olympian Zeus on a throne - a statue so well-known that the Roman Emperor Augustus had a copy of himself made in the same style (without the godly long hair and beard). " Source: here
This false portrayal has been used in certain "Christian" denominations for far too long, and one wonders why they wish to portray Christ as being effeminate.
The example we have from the OT is Ex. 20:4,
"Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth." (KJV)
(All bold emphasis is mine.)