Whatever you do, do NOT fill an entire panel with a lifetime supply of text. There are intuitive parts of a conversation that require showing what a person does or says while they're talking.
Try watching a scene from a favourite movie and make a note of what the camera shows, and what people are doing while they're talking.
Do they have a prop that they use? Are they really expressive with their hands? Are they anxious, fidgeting about? Are they angry and pacing about the room? Is the moon out, capturing one character's imagination as they muse in it's light?
You should also consider the mood of the scene. Is it tense? Maybe you want an ominous shot up at an animal's head mounted on the wall. Maybe you want to show the dramatic shadow from a roaring fire sweeping across the floor, giving a sense of plotting going on. Perhaps it's a peaceful time, where you can let reader's eyes wander through the natural wonders of the forest: a closeup on a flower, a bug crawling up a tree while the characters walk past in the background. Maybe it's a villain who's cornered our hero, so you tilt the perspectives to personify the imbalance of power.
Use the conversation to your advantage to give people a tour of your world without having to tell them about it through exposition.