I took a few photos of my portfolio which contains work from my interior design year and my visual merchandising year. In my portfolio I have collages, sketches, styling photos, 3D drawings, room descriptions, lighting plans, room sets etc. The purpose of a portfolio is to show how versatile you can be and how good you are, so never put a project you don't feel represents you, your style and justifies how good you know you are in your portfolio. Also, keep it simple. Don't make a very complicated design on your portfolio, remember that there are going to be a lot of different people with different taste that is going to look at it!