How about a square image in aquarell style, showing Fiver and Hazel. Fiver has his ears folded back as he describes his first vision to Hazel. They are still near Sandleford Warren, right at the beginning of their story. The exquisite detail of the picture represents the beauty of the story itself ...
Workflow
Second result with this prompt. I had to tweak their size a bit. ☺️☀️🐦⬛