Drawing from a photo is going from 2 dimensions to 2 dimensions, it takes skill but looses some of the magic of 3-D to 2-D. On the other hand, your subject remains still so you can pick up on the nuances.
There were things I would not have noticed if I were not drawing it. I would not have seen the insect bite in the leaf and might not have noticed the moss or lichen on the tree. I also was made very aware of how the birds feet wrapped around the twig and I might not have made note of that and just been dazzled by the color of the bird.
Journaling helps me see and understand how things are connected. It takes me beyond a walk or a book and helps me slow down. It also gives me something to look back and reflect on.