Some fanart intentionally references the style or content of a well known work of art.
Simon and Garfunkel
Leonardo da Vinci
cover art from First Time #40. Spock and Kirk are drawn posing as sculptures by Auguste Rodin.
The Birth of Venus
"Birth of Venus remix" by Leela Starsky, from a 2006 HP Fringeart Challenge
Spock as "Venus on the Half Shell," artist unclear, from Grope Flashback
by Red_Magicmarker, from a 2006 HP Fringeart Challenge, Ginny and Harry from Harry Potter
Kirk and Spock: "Pieta" by Shelly Butler on the back cover of First Time #46 -- see that page for more
Venus de Milo
"Spock de Milo" from Grope #1, artist unclear
Sergeant Pepper's Lonely Heart Club Band
front cover of The Clipper Trade Ship #12, another example of a riff on Sgt. Pepper's Lonely Hearts Club Band, artist is John P. Rielander