Panoramic image composition

If your main reason for shooting the panoramic image is to print it, I suggest you want to avoid positioning the camera close too close to the edge of a piece of scenery. For example, if you position your camera too close to the edge of a bridge, the side of the bridge itself will be missing from some of the panorama, so you do not get a clean sweeping curve running through the finished image.

When shooting for viewing interactively on a computer, try to fill the scene with things of interest, especially if you are using a wide angle lens. Experiment with the camera position so that there are things in the foreground or close-up as well as things of interest further away.

If there is a very strong sun and it causes problems getting even lighting in the scene, try positioning the camera so that the sun doesn't shine directly on the camera. (For example, align the camera so that a tree blocks the sun and you just get a glint of sunlight on one side.)

Far too much empty foreground
Slightly better, but overall the castle still seems quite far away with lots of empty tarmac in the foreground
People provide some foreground interest, context and scale
To avoid a featureless blue sky in this spherical panorama, the shot was taken from underneath the palm trees, which also helped to reduce the intensity of the sun

Inspiration

If you need some inspiration for your panoramic photography, have a look at these books by successful panoramic photographers