Consider these techniques for your podcast:
1. Vivid descriptions - Use detailed language about colors, shapes, textures etc., engaging multiple senses while describing scenes or situations.
2. Engaging narration - Vary your tone, pitch and pace based on emotions or actions happening within the scene being described.
3. Sound effects - Enhance atmosphere with strategic sound effects such as background city noise when describing a bustling street scene.
4. Music & Ambience - Choose appropriate background music or ambient sounds that align with the theme of your podcast.
5. Dialogue & Characterization – Give characters distinct voices and personalities by describing their appearance and circumstances vividly.
These tactics will help make even an audio-only medium visually appealing to listeners.