The Black Rock & Riverside Tour of Gardens Committee is seeking original artwork to use on the cover of their beautiful 12-page color map guide, as well as on posters and other promotional materials, including T-shirts. The winning artist will receive a $200 cash prize. The deadline for submission is Wednesday, April 30. The artwork can be a painting, drawing, illustration or mixed media work and should be related to a garden landscape with statuary, an arbor or water feature…