[Question] How to theme The UI with Anemone?

Hi, I think I know how to theme the UI. I just have this big doubt about it. I'm not at the studio right now to test but is there something like a size chart?

I've been looking at examples an documentation (none for anemone). They're all different. Some say that 20pt is about right but I believe that's for older devices.

I guess I just have to use tiny pngs?