I won’t say what I did because I’m about to go through a divorce and have a kid in college, and so I don’t want to help a competitor (I hope you understand). However, I’ve made it a lot further than anyone speaking in this thread since I first looked at this puzzle almost two weeks ago. It’s been daily work, but the image does indeed contain a Wonderland, and more, as the White Rabbit says. It’s a real rabbit hole, so to speak, and it doesn’t require specialized software that you can’t find for free online. I hope to solve it in the next few days, and when I do, I’ll show you some of what I found. I do recognize that anyone who’s gotten anywhere with this might have kept it to themselves, and so I might not be the first to solve it. In that case I’ll still show you some of what I found.

Truly, it’s the most impressive work of art I’ve ever seen. Its appearance is deceptive.