I looked at the pics in the articles, and I do not see any of the things they say are painted.
[1] You can interpret is as "I am not an Archeologist" or "I am not an Artist". Both are correct.
I wish all ancient drawings had such a version so we can easily interpret what they are talking about in the article. Early cave drawings are very hard to decipher.
After seeing your drawing, I see another way of interpreting this image. What if the bull is facing right and not left. The dark spot is his upper back. Can you see it that way too?
> The painted head of an auroch, an extinct wild bull, was the first painting archaeologists discovered in the cave.
so I think it's only the head.
The other drawings are also only the head, so it may be a local style/preference (???).