You're being tested as a tattoo artist and you have to do it well or you will be fired! Use the needle to draw the tattoo and then paint it. You earn points according to the precision of the drawing, time required to complete it and amount of inflicted pain to the customer. Try to draw as close as possible to the original drawing, or you'll lose points and even the game.
Click and drag to draw, but stop every so or you will irritate the customer skin so much that he will be furious and leave. You finish when the progress meter is full.