For the past decade, Sue Schubel has been making detailed decoys of terns, puffins and other seabirds to entice real ones to restored or new homes Sue Schubel hand-paints around 500 a year from her workshop in a converted barn steps from the ocean in Bremen, Maine, a tiny town in the lower third of the state’s craggy coast. Jean Hall/National Audubon Society Seabird Institute Some of the decoys are more intricate than others. To make a convincing brown noddy, you need to carefully blend the transitions between the bird’s dark body and its light throat. Terns, though, can pick up on symbolism: To replicate one, you need only to stick a smaller gray block atop a larger gray block and draw a red slash for a beak.…