Visual: The visual is big and catches people's attention first. The visuals show us show us a thumbprint, which goes along with the text appropriately. A thumbprint is something unique to all of us and cannot be replaced, lost. It gives us our identity, and no one else can steal it.
Textual: The text is the first thing read after being read. The text says Be yourself; everyone else is already taken. The visual goes really well with the text as a thumbprint is who you really are, and you should be like your yourself. You are unique, and why copy others when they are all acting like themselves. So you should also act like yourself, or else people will know that you aren't yourself.
Typography: The text is in cursive and relatively big.
Purpose: To tell that you shouldn't copy people and their behaviour to be more popular, liked by other people because you are unique and you should be yourself, or else people will know that you aren't yourself.
Audience: General public, people who keep acting like others.
Culture: For people to act on this meaningful quote.
Context: Many people these days are trying to be more liked and favoured by copying other people.