Judy Jetson grew up and became a swinger: That’s the impression one might get the first time viewing a Shag painting. The artist Josh Agle—his nom de brosse comes from the SH in “Josh” and the “AG” in Agle—is known for his martini-clutching mod characters in swanky spaces rendered in saturated colors with a distinctive mid-century style. Lithe ladies in bobs and beehives and their cool-cat men lounge on boxy sofas and egg chairs, or sip tropical drinks in bars next to zombies and skeletons while bongo drummers and guitarists play on.