Im guessing you didnt mean for the bottom of the river to be almost cut off on the bottom right of the photo. If this is the case, this means that you had to do some cropping, and this is what you came up with. What helps with this is if you actually go against what you think and shoot the photos portrait. It may take 10 photos instead of 4, but what you end up with is the same photo, only more of the scene from top to bottom and the same amount left to right. Also, allow your camera to meter, take those settings and throw it into M with those settings. This will make sure that the entire panorama is shot at the same exposure value. This one looks well done in that respect. Also, watch the corners of the frame more so than the middle. For example, shoot your first shot making sure you have the object in frame where you want it. Then, without moving your head from the camera, look at the bottom of the frame and see where it's cut off. For the remainder of the shots, try to make the "line" created as straight as possible with your first line. This will minimize cropping later. Ive done quite a few Pano's this way and it works well for me.
Keep going! :thumbsup:
Mark