Don't get me wrong, they are all beautiful, but some of these don't really turn the scars into art rather they cover them up with art. Just pointing it out.
It still helps people feel more confident about their body. Some people just want to hide or forget their scars, without them being displayed as some romantic piece of art. I like both styles, it's ultimately what the person feels most comfortable with.
It can be very difficult to tattoo on skin with scars, it can look distorted, ink may not take properly, and they can be more prone to infection. Make sure if you plan on doing this you find a good tattoo artist and make sure they are comfortable tattooing on the scars, you don't want anything that is going to make a scar look worse.
I might get a tattoo over my scars now