I organize my gallery by series and then by
episode # (OP/Eyecatch coming before all else).
I try and screencap as many of my cels as I can,
so as long as I'm figuring out what ep they're in
I might as well organize 'em that way. ^^ In
theory it also prevents spoilers since anyone who
hasn't watched all of a series can stop looking
through the cels once they get to cels in eps
they haven't seen. If I have several cels for
one ep I try and list them in order, but I'm not
picky about it. If I can't nail down an episode
ID the cel is placed at the end of the gallery
for that series.
If I have less than 3 cels for a series they get
lumped in the Misc section, which is currently
organized alphabetically by series title.