Inspired by Kevin's Swan Lake, I put this together (though it's not perfect yet). I'm working on some refinements in the reeds for inclusion in the NWDA shop.
Soft shadows (0.6 @ 6), render subdivision settings (@ 0.5), it took 2.5 hours on Q 0.5 and AA 8 (1/16 and threshold 0.1), one fill light and GI 1/1/8.