yep, actually, the historic panel is the way to go.
for your purpose, checking last / previous version of a wip drawing, I'm sometimes still using
this (pre-historic) alternative, invoking the Spare page :
- version 1 of the drawing,
- Copy-to-Spare ( hitting Ctrl[J] shortkey for me, it could be a different one for someone else)
- re-work, ... up to version 2,
- swap to version 1 / version 2 / version 1 / version 2, ... by hitting the [J] shortkey (it could be a different one)
(here, [J] is for "Spare Swap", or "Spare Exchange", 2 appelations for the same thing),
when happy with the version 2, but feeling it's still improvable, I "copy-to-spare" it by hitting Ctrl[J],
- continue to work on it ... up to version 3,
- swap to version 2 / version 3 / version 2 / version 3, ... by hitting the [J] shortkey,
... and so on, until I'm plenty satisfied, then go on to the next drawing.
basically, it consists to keep the version n-1 always at hand (on the spare page), ready to be recalled,
just in case, ... you know, repentance is a common feeling for artists.
ps : I personnally use a custom "Copy-to-Spare" command, assignated to my Crtl [J] shortkey,
which Kills the existing spare first, then copy (the current frame) to the spare page.
with this one, I skip the perpetual popup question "
... blabla ... do you want to replace it ? ",
question which requires an answer "Yes" or "No" to go on (breaking my workflow),
process that could become tedious when repeatedly I have to Copy-to-Spare on a
not empty spare page.
ps2 : the advantage remaining of this "pre-historic" working way, is that you can make easily a sort of "mix" of the 2 versions,
by restauring part of the (spare) version n-1 by drawing (filled stroke tool) on the version n in Merge mode.
