In the visual arts, the term mixed media stands for using different media in the creation of a work.
An example of mixed media is integrating graphic elements in a painting on the same painting surface: this is then neither a collage nor multimedia.
Especially with adhesive techniques, it is important to allow the individual layers to dry well and to apply oil paint – if used – last. When using many or heavy materials, the painting ground should be particularly firm, wood is often used. (Wikipedia)