Well, it was good enough for our future king. Both William and Kate studied Art History degrees although William later switched to Geography.
Are you any good at it? What will be your next move post A Levels?
If you are good and passionate then you might have more chance of getting higher grades.
If it's more something that is of interest, you might be better off studying art as a hobby and going with qualifications you know you're going to nail.
Unless the plan is to go and work for an auction house or something, in which case check out their websites for career opportunities to see what their preferred candidates look like.