Billsville Mike:
6930 piece "Judgment of Paris" by Henryk Siemiradzki.
Billsville Mike:
5000 piece puzzle, "Entrada de Roger le Flor en Constantinople," by Moreno Carbonero
Eddie Maiden:
Found on reddit.
David (USA):
Kyelimbooks 2014: Ultima Thule
Doug Scobel:
Snagged! (Explore)
larsteglbjaerg48:
Le Parnasse by Nicolas Poussin