Harry has two small tattoos on the front of each shoulder for his mom and sister. He has a G on the right for his sister, Gemma, and an A on the left for his mom, Anne.
In this picture, you can also see the black heart he's got on his left arm, three nails, and part of the 17 Black on his pec, among others. He even has his sister's name written out in Hebrew on that arm.