After I made them aware of the fact that it's my restoration of the artwork they were using on their promo material, they were VERY humble about it. In fact, they found my version on Google and assumed it was the source artwork (and Disney apparently were okay with them using whatever they couldn't deliver themselves). They even had one of their artists remove the logo from my version, so they were somewhat shocked when I linked them my logoless version. Anyway, yes, I've got compensated and am now doing more or less regular paid work for them. I've contributed artwork to their releases of "Jedi Knight", "X-Wing" and "TIE Fighter". We'll see how much artwork Disney can deliver for the Monkey Island collection, and if I can contribute to that as well. Their reaction to my complaint made clear that this is a group of fine folks, well aware of the value of fan contributions (hell, they are fans themselves, otherwise they wouldn't put effort into releasing old games).
Another discovery I made was when watching a flip through of Bitmap Books' Amiga compendium on YouTube, spotting my Monkey Island and Simon the Sorcerer restorations in there. I felt a bit silly bringing it up to the author 6 years after the release of the book, but it turned out Steve Purcell himself directed him to my poster thread. Ah well, in an artwork heavy book like that I understand that those two artworks are just a drop in the bucket.