Unfortunately, I couldn't find a full gallery, so here's the best I could find. It has every scene up to version 7.5
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As for Katrina, you're supposed to lose to her once. After that, you can go down the stairs in her keep to access the catacombs, where you can fight enemies to level up. Don't worry about losing soul shards, by the way. If you lose all three, you don't get a game over, but instead a sort of 'continue' option, as well as a stat boost, and you won't lose any progress. So far, corruption doesn't seem to have any effect, but that is subject to change in a future update. I believe that covers everything, so if you have any more questions, let me know!