Those subjects are fine for both the courses you're interested in and getting into top universities. While a subject like Art might not be considered as useful for a degree at Oxbridge than, say, Physics, it doesn't matter if you have a selection of other tough subjects. One or two subjects like Art/Psychology/Media is fine with 3 strong, traditional subjects. It's only when people have only 1, or even none, of these 'facilitating subjects' that it will disadvantage them.