What I look the most on these is that they are all really original, I've never seen anything like them, maybe #1 but the rest are really outofthebox.
#1: Really beautiful tones, I like the silhouettes and I especially like that there is still detail in them!
#2: Another good one, minor nitpicks would be to clone out the sand(?) and such from the sky, but that's just my opinion.
#3: This one made me say 'oh shxt! a fish!' Haha, really interesting subject and nice red hues all around.
#4: I love how there's little buildings on the globe! I like the lighting from the left of the globe, to the right it gets a bit darker but it's still an awesome photo!
Overall: I love them all, she's got a great eye and wonderful photos!
P.S.: Where were these taken?!