Who knew? Evidently, freshwater sponges live in cold streams in the Adirondacks. Here's an illustration I did for the upcoming issue of Adirondack Explorer about the subject. The colors are very saturated and brighter than they appear in print. This is intentional so that on newsprint, the colors don't look too dull.
1. Sketch 2. Line art 3. Final art.
Final art. Line art is scanned and color is added in Photoshop.