It's a nice shot...but I think having the building more central might have added a cherry to the cake
Lovely colours and reflections
I see what you mean I think there is probably too much sky but i am sure the experts on here will give you better advice. The colours are lovely. I think I would have liked it a little more to the right to get more of the canal boats in.
One odd feature is the colour of the water, it looks almost Caribbean. You could crop it to a square, that would allow you to lose some sky and keep a classic aspect ratio; Klimt used to paint his landscapes in a square. Some odd ideas that might help resolve your concerns.
The tree competes with the building for your attention and the sky, although a beautiful blue is largely wasted space.
On the plus side the exposure is spot on and you successfully recorded the scene. I would have chosen either the tree or the building and worked out a composition that gave them prominence.
HTH!
For me the thing that makes it seem strange is the apex of the keyside being off-centre. The converging points lead your eye to one side.
It still a nice shot on a stunning day in a lovely setting (when was that, I obviously missed summer this year... )