input: [Reference Type] Photo of a person [Drawbacks] Like above, any photo will need to be first translated into a tattoo. Some tattooists first recreate the image on paper with much detail, others use only a basic framework from the photo. If you want to see the recreation on paper first, you may need to negotiate this with your tattooist. WARNING: If you want to get a portrait tattoo, make sure you find a tattooist who specializes in doing this type of work and examine their portfolio carefully (they should provide both the original photo and the tattoo in their portfolio). Portraits can be one of the most difficult tattoos to do because there is no room for error. If anything goes wrong, it will not look like the person (or pet) it’s supposed to. [Benefits] 
output: A photograph of a person (or pet) is the best source of reference possible if you want to get a portrait tattoo. Photographs can also be used to convey particular positions or poses you want a person (or caricature) in a tattoo to have (jumping, swimming, reaching, etc.).