Hi Csaba,
The scene of your shot is really nice however, I think there is lack of suitable foreground. I've tried to make this absence a little less by cropping the photo from top and bottom. I've also increased the saturation a little. What do you think?
Suggestion: If you got closer to the boulder on the left, standing close behind it and took the shot of the lake, I think you will get a better foreground.
Kaustubh