A praying Jesus tattoo is usually done from a side profile, either kneeling or standing, showing his head bent forward slightly and his eye shut. His hands should also be clasped in front of his face to signify prayer. Those electing to have the tattoo done in color should consider a bright yellow and orange halo shining behind his head to mirror the angelic images portrayed in many church stained glass windows. The tattoo can also be the bust of Jesus from the shoulders up, which will still show his face and hands.
The martyred Jesus is represented by Jesus dying on the wooden crucifix described in the Bible. You can either choose to have just the image of Jesus with his feet together, arms spread and head bowed, or tattoo the cross as well to show the complete image. There should be a small crown of thorns upon his head and a small incision should also be present beneath his ribs. Even if you elect to have this tattoo done in traditional black and gray, you should still consider using a small amount of red to portray blood drops in both the incision and on his forehead underneath the crown.
A small baby lying in a manger, wrapped in white clothes is the universal image for the baby Jesus. It is just a small portion of a much grander nativity scene representing the birth of Jesus. You can choose to have the entire scene tattooed, but a complete nativity scene could take up a significant portion of your body, so it may be best to just stick with the baby Jesus. Add a small yellow and orange halo behind the infant's head to signify his angelic future.
The Jesus represented in Leorando Da Vinci's "The Last Supper" can also make a prominent tattoo. Again, the complete image may be too large for many people to tattoo in its entirety, so consider just the image of Jesus, standing with his arms spread apart and lying palm-up on the table in front of him. The tattoo can also be done in purposely faded ink and given artificial cracks to mirror the actual mural painting.