Several times in ST:TNG, we see Data painting. While I don't rule out the possibility that these paintings were done by Brent Spiner, I suspect they were either created for the show by someone or found by a Paramount propmaster. Do we have any information on who painted the paintings in the series? In particular, I'd like to know more about The Battle of HarOs, from S7E11 (Parallels).
In ""11001001", we see that at least one of Data's paintings was painted by the staff, and they mention that they painted later Data paintings:
Rick Sternbach: "Oh, I'm sure that the F&SF cover probably inspired me a bit. I don't recall exactly (eggs-actly?), but it sounds plausible. :)"
"I don't recall who had the specific idea for painting the eggs on clear plexiglas. I don't remember doing any kind of production sketch of the set-up (although I might have), so the idea have come from the producers or someone else in props or set decoration. I remember being given the plex and adding the eggs with some acrylic paints. Perhaps we were trying to be a bit too 'futuristic' by not going with a traditional stretched canvas, as with later Data paintings. Nothing wrong with going old school; after all, the Picard family still grew grapes and made wine pretty much the old-fashioned way, as far as we know."
from this link, that @chirlu linked in the comments, although I found it by Googling myself (emphasis mine)
This seems to imply that the artists behind the scenes painted at least some of Data's paintings. I can't seem to find anything on the specific one you mentioned, though.