Advancing the story
Another thing to think about when you write this passage is how to keep advancing the story.
Although there's a lot of description of the landscape, it's not static description: each new description advances the story by making the narrator's situation worse—resulting in him being dreadfully afraid.
As you collect descriptive details to use in your remix, also think about how to order them so you can advance the story and get Bella into more and more trouble.