It's not that we don't think Monkey Island: Special Edition looked bad. It looks great! But if it had looked as good as this fan mock-up, it would have been greater.
Some Germans have put together what they feel a Monkey Island 2: Special Edition should look like, complete with high-res backgrounds made from original concept art, along with a quasi-3D overlay.
Can't say I like their inventory scheme as much as I like the environment effects, but I like the environment effects a lot, so that's OK.
Monkey 2: Special Uber Art [Loneclone]