I already mentioned that a black and white look could work perfectly for any of your other future cartoons.
It is important to compensate for a lack of color by using different shades of white including grey.
Old black and white movies look a bit more colorful whenever it is compared to your new submission.
You could compensate for a lack of color by using cross hatching, dots, comic book graphics and other technique imaginable.
It is possible to create the illusion of grays using a coloring technique called Grey scale.
I recommend using a different color outline for your characters against your background.
This will work as a simple trick for creating more depth for your characters.
If you can create a 3D like illusion in this manner.
It'll be all the better and create a more polished looking cartoon overall.
I look forward to seeing your new movies.
Keep up the good work.
Another review from a long time fan.
- Mightydein