You need to say where and by who because many people have depicted Christ in painting, writing etc in various ways
in the book of revelation
Christopher is often depicted carrying the Christ child.
In the famous painting "The Crucifixion," Jesus Christ is depicted on the cross.
The figure depicted as Jesus seated on the throne in religious art and symbolism is known as the "Christ Pantocrator."
Saint Anastasia's symbol is often depicted as a palm branch, which represents martyrdom and victory over death. She is also sometimes depicted holding a cross, symbolizing her Christian faith and dedication to Christ.
St. Christopher is often depicted as a patron saint of travelers and is known for the popular phrase "Christ be with me, Christ within me, Christ behind me, Christ before me, Christ beside me, Christ to win me." He is also often associated with the phrase "Show me the way of safety, and the path of salvation."
I suppose you mean the one painted by Leonardo. It is important to be specific, since this is a favorite subject painted by hundreds of artist throuh the centuries. Before Leonardo, Christ and the disciples were depicted sitting straight and motionless along the table. Leonardo realized that the natural thing was for them to be upset and agitated by the words Christ had just uttered.
Duccio
The same reason Christ is depicted as a blond long haired blue eyed European and not a Jew. "Racism".
The most well-known figure in Christianity known for his teachings and miracles, including his interactions with children, often depicted as Jesus with a child, is Jesus Christ.
Not in scripture. You can find this in writings of the early centuries, called apocryphal writings.
Aside from doctrine and dogma, the answer is in the name. Christians are the followers of Christ. The word literally means "Christ Like." The ministry of Christ as depicted in the New Testament literally states "Jesus answered, 'I am the way and the truth and the life. No one comes to the Father except through me.'" From a Christian perspective, this is salvation, and the only way to "be a Christian" is to be saved.