Statuettes can be bought or found randomly (Kistandalius in Ars Magicana and Corinna Verdistis would be two of the NPCs more likely to have them). There is a frog statuette consistently in every game (in Nericon's garden), but I think everything else is random.
You reputation went up by 10 when you entered the castle, so there is a net -5 change. There are other quests you can do to get your reputation up. Those you trade with often will have a high opinion of you in any case. As long as the general population is still talking to you, you don't have to worry too much about it.
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