One thing to keep in mind is that, unlike the majority of eroge games, this one tracks a lot of what has previously happened to Aura and will slightly modify scenes for them to be consistent to the specific circumstances. A lot of the changes are text only, but some result in visual changes. The most relevant to my point is the "lewd crest" Aura gets if the curse of lust gets upgraded to the complete version. My overall point being that the answer to your question heavily depends on whether your goal is unlocking all the replay room CGs, or to see every variant of every CG. Seeing everything is significantly more work, especially if you take the Earth CGs into consideration. You need a minimum of two separate saves for the earth CGs if you want to be able to see the differences between the 'normal' and 'sexy' outfit variants, and there's also an optional tan mental change and a platinum blonde alternate hair color option coming in 1.2.
Endings wise, there aren't CGs for specific characters for the victory endings, but Aura can end up in at least four different states. 1.1 has two variants for its ending depending on whether or Aura betrayed everyone or loses through combat. 1.2's ending can only be triggered in one way, so I'm guessing it'll be all or nothing. It's also going to add another victory ending variant. As a final note, at the moment anyway, the twin drills hairstyle variants of the CGs from the festival of greed aren't viewable in the replay room, so if you want to be able to rewatch either scene you need to keep a separate save handy.