Initial Impression:
Crisp but no clear point of focus.
Challenge:
Meets the challenge perfectly
Composition:
For me, this is an oddly composed shot. I think I would have preferred more sky to balance all the detail in the bottom of the picture. However, I recognize that the sun is probably just above the top of this picture, making such a composition impractical. That said, I think you did well with what you had. The boat is the closest to being a focal point in this shot, but isn't big enough to hold my attention for long. I think that cropping out some of the foreground would focus more of the attention on the boat and make the nice cuves of the road a focal point as well while still retaining the feeling of "aboveness".
Technical:
Excellent. Details are crisp the shot is well exposed, even with the difficult job of shooting into the sun.
Overall:
Technically a good shot but lacking in the "wow" factor.