Octavi Navarro immediately comes to mind for a project like that. He has worked on Thimbleweed Park, a game created by Ron Gilbert, years after he made the Monkey Island series of games.
Octavi has quietly been posting his Scenes (or 'pixel art paintings') on Youtube for years now, and for some reason he's been flying under the radar with those masterpieces. He works in a very recognizable retro style that might fit your project like a glove.
Even though most of his videos are years old, he's still active in the comment sections. Perhaps he's approachable for a project like yours.
Here are just 2 of his many gorgeous scenes. 'Space Explorers' and 'Le Cirque Macabre'