I am an artist and have done a series of 10 paintings that I have titled "Notes to Self." Each painting has a subtitle. For instance, "Notes to Self: Breathe" or "Notes to Self: Hope." Someone has asked me if my exhibit label in the gallery should read "Note to Self" singular rather than the plural "Notes to Self." I have no idea and hope someone here can help me out. This is an ongoing single series with more paintings to come, but each painting represents a mental note to I make to myself. Thanks in advance for any ideas!