I love Amsterdam.
It is my most favorite city in the world~!
They're clouds, they aren't always the same everywhere. Sometimes they look weird. I also doubt this person would copy/paste the clouds in, since it's an environment and not a drawn picture, he/she doesn't get credit the same way they would get if it was a drawing.
Quite a long text, I apologize. Also, I don't mean to insult you or be mean to you, just expressing my opinion.
Also, indeed, they do lack the normal depth of clouds, or at least it looks like it.
When I first saw this I also realized the lighting looks a bit weird. A little fuzzy, too soft, maybe. It looks quite "game-like", something that was edited. The water as well, the brown is awfully full, that too looks a bit unreal.
I do love long text, huh? I would also like to thank you for being reasonable (in one of the word's many meanings), it's somewhat rare these days to find someone who appreciates decent conversations.