Gottfried Helnwein: “Of Mice and Children,” Gottfried Helnwein’s 16th solo exhibition at Modernism, captures both the internal and external experience of childhood in a series of new and recent paintings of subjects including Mickey Mouse and Donald Duck. Credit, debt and an economy tugged between old-school physical products and pixelated pixies are just some of the ideas at play in “Promises to Pay in Solid Substance,” a show of mostly new bodies of work by Brooklyn-by-way-of-Canada artist Hugh Scott-Douglas. Included are the ready-mades of “Economist,” the billboard-derived sculptures of “Heavy Images” and the images-turned-wall-sculpture of “Amazon.com,” which snaps at the Amazon distribution center down the hall from the artist's studio.