As host, how to keep an image viewable on the screen at all times for the group

Hi, I teach watercolor painting classes on Zoom. My computer monitor shows my face, and my cell phone is on a tripod so members can see my painting demonstrations close up.

I want to show the final image we are all trying on, without having to use Share Screen repeatedly to show it. Is there a way to keep an image visible to everyone, even while my demo camera is on Spotlight? Thanks so much!