Drawing from a photo seems somewhat easy; you can look several times, find details (even if you don't include them!), etc. I wasn't perfect, but you can estimate distances (where the bird is on the branch, how far the leaves are) etc. It easy to miss things: the moss on and fungi (?) on the tree branch. Interestingly, I didn't draw those because I think I don't really know how! Haha! I haven't really done "nature journaling", but I have spent time with a not so spiffy camera, with a slow motor. It taught me to watch closely/look closely, but I still think I miss lots of details.
This was a nice start. I look forward to what's coming.