Her's a little activity to follow along with and make a small, easy popup of your very own.
Bookzoompa, has a little activity sheet on their blog from 2011, that you can use as a template and some easy instructions.
There are also some excellent links to popup artists to look at including Carol Barton who taught at my old school, The Corcoran...her stuff is awesome.
This is a photo of our Pop-up Valentine's Day cards we made this year at FBAC (pre-Covd19)...we do these every year (well, a different card each year).