I don't have reliable information about a specific artwork titled "Five Generations of Muses" by Paula Rego in graphite and Conté on paper. While Paula Rego is a renowned Portuguese artist known for her powerful figurative works and exploration of female experience, I cannot verify the existence of this particular work or provide accurate details about it without risking misinformation. I recommend consulting museum collections, gallery records, or the artist's catalogue raisonné for verified information about this piece.