One of the main reasons as to why people really do this type of tattooing is because they want to unravel a story that they are trying to give off. For example, I have seen a famous soccer player that carries a full arm tattoo and his tattoo signifies what he loves, which is soccer and the love for his country.
Just remember than the bigger in details your tattoo is, the more expensive your tattoo may get, depending on which tattoo parlor you go to, just keep that in mind.
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Whereas with your local tattoo parlor the artist doesn't have to compete for your business with other artists and often will not work as hard to please you with the design. All of these factors help in getting the perfect custom tattoo design of your dreams.