The sky is really very nice here, but the water seems almost infested with all of those boats; they have an unpleasant effect on the overall composition.
Yellow sky is pretty neat. I'm not sure I like the foliage in the foreground. I look at it for perspective its ok. But it isn't really adding anything either. I would've cropped some of the blue sky off. Pretty nice pic all around. - Inspzil
This would be fun to take at different times of the day and year to see the different affects of the sky and lighting. I really like how you have this cropped by showing only a necessary amount of the foreground foliage and lots of sky. It really gives me a good feeling. A polarizer filter or a split neutral density filter probably would have helped to darken and enhance the sky a little more. Nice job. 8 -Tim
Nice sunset but seems a tad overexposed maybe. It could stand some darker colors in the sky and more of a silhouette effect on the boats. The green in the bottom corner is too much of a contrast with the rest of the shot and probably should have been eliminated somehow.
The powerful ness of the dark hills and foreground is lost slightly by the lit bush in the bottom right corner - perhaps if your going to print wash that bush out to black first (I realise you can't do that for the challenge). Otherwise a good photo.