What kind of materials did Pablo Picasso use when painting L'oiseau 1928?

By 1912 Picasso was incorporating newspaper print, postage stamps and other materials into his paintings.

Answer 2:

The above applies to the period of 'Synthetic Cubism' 1912-1916.

In general Picasso used not only oil paint but all techniques you can imagine: pencil, watercolor, engraving, linoleum print ...