Great foto, great start on the replication.
Because of the high standards we are used from you I add some crits I wouldn´t have mentioned to a mere mortal:
The cliff looks way smoother in your version and is the part that still says cgi in my opinion. The river below the waterfall could have some attention (althogh I couldn´t make it better, I suspect you can)
Concerning the green: Your dark green bushes simply are not there in the original, but I like them. The light green is even more saturated in the original. As far as I can tell from Fotos, greens are often unbelievably intense in contrast to the volcanic vastness of iceland.
Cheers,
J