Typical android efficiency. He painted Tasha identically because the two paintings won't be in the same room.
Would this technically make anything Data paints AI art?
Technically no, since data is a full on artificial life form. Modern AI is just programmed to create the illusion of sentience.
What is "artificial intelligence" and at which point does it become "natural intelligence", if at all? Arguably, anything man-made that has any sort of intelligence, no matter how advanced, even if surpassing creator's intelligence, remains "artificial". And as you said, Data is an artificial life form, therefore its intelligence is also artificial.
Modern "AI art" isn't really made by artificial intelligence. It's just a really sophisticated pattern recognition/prediction algorithm.
After the first two panels I thought this was going to be a joke about AI generated art not being allowed in the contest.