I'm a huge fan of double majoring. I double majored in English and a second major I created (mix of Philosophy, Political Science, and Economics). It was a great experience and I felt like I was able really dive deep into both fields. The plus side is you get to study all the things you are passionate about. The down side is that by double majoring, you'll have less electives available to you to explore classes outside of your two majors. Minoring is a great way to get more flexibility.
At the end of the day, when it comes to humanities, what your major in doesn't really affect you job prospects. If you are interested in pursuing a career in art, you should make lots of art. It's all about practice and getting your work out there. Same goes with graphic design. Having a degree in art is helpful but at the end of the day, potential employers and clients will be interested in your skill and portfolio. I'd recommend looking for internship opportunities and building out a portfolio as both will be really valuable when you hit the job market.