When making an animated project, be it a movie or series, there is one key factor you must ALWAYS remember and a rule you should follow: that the animation be as good as it can be.
Make sure you use a good color scheme, that everyone and everything has a good design, and movements are as fluid as possible. At least two out of the three should suffice if you are unable accomplish all of them. There have been animated works that didn’t do any of those and are unwatchable for it.
To be fair, you may be working with a limited budget and resources. But that doesn’t mean the animation has to be subpar. Just do the best that you can with what you are given to work with. No one like a cartoon with ugly animation that was made with little effort, no matter how small the budget or short the time or how limited the resources. An animator’s job is to make a cartoon as good looking as it can be. Many viewers are open-minded and understanding about such elements can forgive if one animated project isn’t as good looking as another. But they will not understand if the animation is ugly.
So remember, design, colors and movements are all key elements of good animation. They should all be as good as possible. Even if they aren’t perfect, they should still at least appeal to the viewers on some level.