Basically I was an idiot and said the subheading was her contention.
Something along the lines as, in the past the tattoo were for degenerates and now they are more positively viewed and widespread.
In addition, Days used the bookcover to acknowledge that some may regret their tattoos done out of peer-pressure but the visual does not necessarily challenge Days contention as it does not oppose getting a tattoo. I also said that, Days does not seem to show regret over getting a tattoo and provides a positive portrayal of getting a tattoo.
Now in hindsight, I see that Days contention was that the "power of ink" has decreased in modern times, they used to be meaningful but now they are meaningless and has degenerated into mere fashion statements. Furthermore, the book cover agrees that tattoos done out of peer pressure or just ill thought could cause regret as they are meaningless, similar to Days' which no longer symbolises her rebellious past.
I think I did the other things all right... do you guys think I would be able to get at least a 6/10, since I stuffed up the contention?