Composition can be a huge problem with panos. You see a vista, but the eye focusses on certain sections, one at a time. You include the whole scene through the stitching process, from left to right, wider than the eye can take in without turning your head, and the final composition may not work.
I feel this is the case with your pano. You've sort of got two central themes, the lake and sun on the left, and another lake on the right. In the middle, a bit left of centre, you've got a dark nothingness which tends to attract the eye and spoil the composition.