For most fine art and design students, the first year consists of a foundation program that introduces a variety of mediums. The ideal portfolio demonstrate experimentation in at least some of them, like oil, water color, pastels, and charcoals. Mostly, schools prefer to see a free hand sketch work that is sketched daily and completed in a short amount of time. It requires a long practice of line drawings and schools love to see your ability. Also your portfolio should reflect history of the applicant drawings rather than the outcome of best works.