Whenever I want to produce a half-tone effect in Photoshop, I invariably have to look up how to do it. It should be more straight-forward than it is, but we don’t use half-tones in images as much as we did in the pre-digital days.

Below is a good tutorial for the halftone effect that’s been online for a number of years now. (HT Dylan M. for finding this.)

https://www.thegraphicmac.com/create-comic-book-halftone-dot-effect-your-photoshop-images/