The issue of paintings in Sims 3 is a lot more complicated than it was in Sims 2. In Sims 2, all of your Sims painted the same paintings, and the paintings varied by skill level. For the most part, the sequence of paintings was fairly predictable.
In Sims 3, paintings vary from one Sim to another, along with their skill level. According to some early press releases, the paintings your Sims produced could also be things that they had seen. I remember a quote somewhere about how two Sims could go to the beach, come home and make paintings, and each painting would be slightly different, depending on the Sim's interpretation.
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