Both black & white artworks and artworks in color are important to include
Make sure that you have both black and white artworks as well as artworks that display a full range of color. Black and white artworks are important so that you can demonstrate an understanding of a wide range of tones and value, and to explore contrast and lighting.
The color artworks you show in an art school portfolio should demonstrate that you can either layer or mix colors and get beyond painting with colors that come “straight out of the tube.”
Experiment with a wide range of different color schemes. You can include some monochromatic artworks, some pieces that have a more subdued color palette, or a pieces that use highly intense, saturated colors.