Enzie,
When i first started this statistical market analysis many years ago, i tried many different ways of analyzing the raw data. The amazing conclusion of the analysis is that art pricing displays a direct correlation to price per square inch regardless of the subject matter. There is also a direct correlation to perceived reputation but virtually no correlation to any other factors.
Now to answer your questions:
1) With portraits or figurative art there seems to be a 10 to 20% boost in price for each additional figure. However, this is not a hard and fast rule. Some artists don't show any price change.
2) Animal or pet art commands the same price as all other types of art.
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