What are the routine practices in Post Production

Hi guys,

I hope this is a right place to ask this question.

I’m fairly new to animation. Currently I am finishing my first 2D animation, and I was wondering about what could be done in the post production phase. Because now my animation looks so simple and naked

So my question is what are the most practiced effects in the post production phase, to improve the overall look of the animation. For now the only idea I have is to add grainy look to the animation in AE. (FYI I’m using illustrators, ToonBoom Studio and After Effects)

Thanks in advance.