From a couple of interviews I did, and a whole bunch of advice I have been trying to collect. I would say the best is to be confident of the work that you do and how it blends in with the direction of the program. Best advice I was given " remember you are interviewing them as much as they are interviewing you" so, try to ask questions that really relate to the program and how those are meaningful.
I was told to bring my best pieces for the interviews and found myself only talking about 2 or 3 since the time was very limited.
I think interviews are more about the bigger direction your work is taking, less about each one of the pieces and more about your full body of work. Remember they have seen your portfolio already.
I made the mistake of not asking about specific faculty, don't make that mistake. Try and research them and ask at least one question regarding the faculty and their work.
I don't think I am a pro when it comes to interviewing, but that's what I have been told and seems to be working so far.
Get some rest and nail the interview, you already made it through the first part now show them face behind your work and how the individual can rock their program.
Hope this helps, and best of luck!