This is what I'm getting: (you need an account to see links)
Minus the text at the bottom, with a capitalized 'D' in the bottom left corner and a capitalized 'A' in the bottom right corner, for Dumbledore's Army.
Rate it?
To be honest, I think all tattoos are personal. If it is something you want, then go for it. Don't listen to anyone else, it's your body and you can put whatever you want on it.
At least it's a tattoo of a book series that has lasted a good while, not a fad that you may later regret.