The portfolio is supposed to show examples of your work that best illustrate your abilities and interests. The number of works shown is not fixed. We do, however, encourage you to make a careful selection. Try to show a range of skills and also processes. We are not only interested in the final outcome but also in the steps you took to get there. We want to see modelmaking, sketching, failure, all that is part of a design process.
Also briefly explain your projects so we can understand them. Make sure you safe your portfolio with a decent resolution so that text remains legible.