The new eight-part series “ArtNation” (Smithsonian, 10 p.m.) collects features from “60 Minutes” and “CBS Sunday Morning” about artists like Bradfield, above, but also actors, dancers and musicians. It’s hosted by Demin Richards of “Yellowstone” fame and accompanies “The Exhibit: Finding the Next Great Artist” (Smithsonian, 9 p.m.), the reality competition that was made for […]