I was just thinking that's "cease and desist" bait right there.

Alice in Wonderland (the book) is in the public domain. The old Disney movie is still in copyright, and the cover image does look very much like it's from the movie, but that character design is from John Tenniel's illustrations which are also in the public domain.

The character design is. The image, however, is clearly Disney flavoured if not traced directly.

His version, for example, does not have the distinctive bow. The art style is also completely different.

True - it would be a good idea to use a Tenniel piece instead.

Edit to add: I was mostly trying to push back on the implication that Disney owns Alice in Wonderland (and Peter Pan, Winnie the Pooh, etc). Now I re-read the original comment, they did specify "Disney-based", so maybe I'm over-reacting!