WASHBURN, Wis. — “All we hear about is the North Shore. We don’t hear about the South Shore,” said Jamey Penney-Ritter. “But we have all these beautiful little spots here that people absolutely love, and when you discover that and you keep coming back, it’s almost like being addicted.” If you have a Northland travel poster on your wall, or on a magnet, or on a mug, there’s a good chance it was designed by Penney-Ritter. That’s especially likely if it represents the kind of small city, state park or local landmark that doesn’t typically get advertised in travel agencies or airports. “Nobody had ever done travel posters, really, in…