A self-portrait is a representation of an artist. It is drawn, painted, photographed, or sculpted by the artist.
Look at the paintings of: Durer, Picasso, Picabia and Frida Kahlo.
Now it is your turn to paint or draw your self-portrait. Try to use the collage technique to make it. It's much more fun!!
Check the princetnol page to find out other ways and materials to make yor portrais.