If you need add coloring noise in you arts, this’s the brush that you need.

How I use this?
- Add the Brush in your set brushes;
- Select it;
- Create a new layer, using the mode : Soft Light;
- Using the brush where you want.
Easy! °(❛ᴗ❛)°
Below, has an exemple:

If you nedd add grayscale noise, access this link: https://assets.clip-studio.com/en-us/detail?id=1739381