The 3rd iteration of Mia, the land o lakes mascot, was created by Patrick DesJarlait, the artist you reference.
It was orignated by a white dude in 1928. And remade by another white dude a few years later in the 30s.
In my view, here's the problem with Mia. She's a mascot intended to sell butter for the profit of a company owned & operated by white people.
Not the Ojibwe people. Other than the artist, did any of the tribe see money from that usage?
Now, if the Tribe had started and grown the business, and made the decision to have Mia created for the brand- go for it. Make all the money.
But that's not what happened. Some white dudes used the popularity of Native Americans in popular culture to make people think their butter was 'pure and natural.' And that's just more racist stereotyping. Subtle, sure, but it's still there.