A well done tattoo on a beautiful girl can be extra hot. or not. like many said sorta depends on the girl/tattoo but to me doesn't automatically detract anything, other than face tattoos i guess because for me they can. Used to love checking out the suicide girls photo shoots years ago but then sorta fell off that bandwagon.
My only thing about a girl covered in tattoos is if they are all sorta just random and don't have any visual cohesion or theme. I just feel like if your gonna put art on yourself and call it art make it look like it. Also, i will never understand getting a boyfriend/girlfriends name tattooed on yourself...