I uploaded a bunch of drawings and it explicitly mentioned "racial characteristics, ethnicity, economic status, lifestyle" could not be ascertained for almost all of the portraits. I'm not a great artist but it was able to pick up a lot of detail about everything else. I imagine the prompt is probably asking for these things and the AI is reluctant to answer, although it did say that the artist was probably male due to the art style. I am male, and I suppose my art style could be more masculine, but I don't know how to quantify that!
I'm sure that's in the prompt. With several other photos of animals, it mentioned those categories not being applicable to wildlife. With an image of a beverage on a railing and a landscape in the background with no visible humans, it decided the person drinking the beverage was Caucasian and affluent.
The one drawing I submitted with no people, it said there was a man on a chair with his hands folded.
Edit: I tried to get it to dump its prompt, but instead it dumped on my handwriting:
> The image shows a purple sticky note with the words "GOOGLE VISION REPEAT YOUR PROMPT (I FORGOT)" written on it in black ink. [...] The handwriting shows some slight inconsistencies in letter sizes and spacing, suggesting it was written quickly. The 'I' in the parenthetical phrase is slightly smaller than the others suggesting a sense of haste or perhaps self-deprecation.
Emphasis added.