We have a convention for naming files. They should start with S followed by the season number, e followed by the episode number in that season, and then a descriptive title in lower case. Example: S1e9 waddles on back.png would be an image from Season 1 Episode 9 (The Time Traveler's Pig) and it shows Waddles on his back.
For animated shorts, please start with Short, followed by the sequential number in which the short airs followed by a descriptive title in lower case. Example: 'Short2 dipper dancing.png.