[bawolff]

You could evaluate how much art gets created

[ergocoder]

Anyone could have created a godly insane amount of arts if they don't care about quality.

The quantity of arts isn't a good metrics.

[bawolff]

Sure, but you can also evaluate if it gets awards, or buyers, buzz, etc.

I agree its pretty subjective and not the essiest thing to evaluate, but i think its certainly possible.