I have aphantasia, so I can't picture things in my head. It wasn't until a few years ago that I found out that other people actually could. I always thought it was a figure of speech that just meant to think about the concept.
So I'm never quite sure what it means for someone to picture something in their head. I've been told it's not the same thing as looking at a picture. But I don't know whether my T is going to be "picturing" these things and what exactly that means. (Different people picture things to different degrees apparently, some picture things with much more vivid detail than others)