Seeing as how I must go back to writing something for myself anyway I shall not write dissertations on these paintings, but rather follow the OP's lead and simply list the following paintings which come to mind with great immediacy, off the top of my head... Having said that, I do adore many of the OP's choices such as Andrew Wyeth's "Christina's World," a perennial favorite; Georges-Pierre Seurat's "A Sunday Afternoon On The Island Of La Grande Jatte"; William Turner's "Mount Vesuvius in Eruption" and many more... All of the OP's selections are choice. As are the ones represented in Laserblast
's post and more here as well.
Pablo Picasso's "A Girl Before the Mirror"
Picasso's "Three Musicians"
Edouard Manet's "A Bar at the Folies-Bergčre" devastates me every time I look at it:
Claude Monet's "Water Lilies"
Marcel Duchamp's "Nude Descending a Staircase"
Leonardo Da Vinci's "The Lady With an Ermine"
Henri de Toulouse-Lautrec's "Dance at the Moulin Rouge"
Anders Zorn's "Castles in the Air"
Paul Klee's "Twittering Machine"
Ivan Shishkin's "Morning in a Pine Forest"
Jean Renoir's "Le Moulin de la Galette" (pretty sure it's one of the bases for all of the "Where's Waldo?" and variations thereof exercises, haha)
Thomas Moran's "An Arizona Sunset Near Grand Canyon"
William Merritt Chase's "Fish"
Rembrandt Harmenszoon van Rijn's "The Return of the Prodigal Son"
Well, I think I'll let it stand right there. Could go on forever and I don't have the time, sadly. Tremendous thread idea, I'd been kicking around something similar. Glad you went ahead and fired it up.