So, I would say that if you haven’t read the book or didn’t watch the show, the graphic novels might be a little confusing. They do explain some things, but it isn’t to an extent that if the information was new, it would make sense.
The art in this is beautiful (and I wish I could have gotten a screen shot of some of them, but I had a physical copy). They make even the ugly people look pretty, which actually may be a flaw in the art… now that I think about it.
It doesn’t cover the whole book though, so you’ll have to get the next volume in order to get the full story of the first book, The Game of Thrones!