It reminds me of the old Disney movies – Sleeping Beauty, Beauty and the Beast, Pocahontas. The backgrounds were visually striking – accurate to nature, yet designed to be easily read.
I try and keep that in mind when I do illustrations. It can be easy to either clutter up or leave too plain. But I think if you work smart with separating your lights and darks you can put in a good amount of detail without overwhelming the overall composition.