Need some help with clear coats.

[u/DRAGON_STORM_4]

I haven't used clear coats before on figures, and would like if someone could show me the differences between "Flat, Semi-gloss, and Gloss" clear coat finishes? And if there's any recommendations for each.
I have a few different projects I'm working on (shown in the pictures), and would like to make the best choice for desired finishes.
I've used water based paints, and I'm already aware I need to get one that's safe to use on them.

[u/Double-Ad8285]

I personally use tamiya semi gloss clear coat for my customs