Thanks for all your comments.
@ Dhavalmistry:
The Title only meant to say that it needed my -female- friends question if it was possible to make a creek to motivate me to make this image in a day and a half
The problem is that I didn´t want to make a fjord or even a stream, but a small creek.
So I tried hard to get some more dynamic water. It did´t come out that well, but after 7 hours rendertime I liked the forrest to much not to post it.
I will have to work on the water. :/
But there are parts of the water I really like. And others I don´t like: