I’m not sure where the phrase “show me, don’t tell me” first originated. I think it was through exposure to creative writing exercises and other writing efforts. But I took that to heart. I took that seriously. And in many ways that influenced my approach to poetry writing.
You don’t want to just say “she was upset”; that doesn’t tell you much. But instead you describe the used tissues scattered on the bed, the box laying nearby, how her eyes are puffy. You acknowledge the remnants of a bowl of ice cream. You describe the girl curled up on a bed, clutching tight to a pillow or stuffed bear. These images offer more details, they help tell the story. She probably didn’t just screw up a pop quiz; it’s more likely that she had a fight with her boyfriend or they broke up.
I was much more interested in showing the details of a story and describing the scene versus being straightforward. I still had trouble balancing what was described and how much to describe rather than saying things outright. I often went overboard on the descriptions and imagery, especially early on, but I was trying to find my style, trying to figure out what worked. How much detail do you really have to give?