That voting graph should look different for a shot like this. You did well with this image and the right angle them comes through strongly. The exposure on the reflected glass is perfect, pleasing to eye and the clouds are making this work even better. Love the touch of greens - growth coming in on the right bottom corner. These are basic strong elements which makes it work.
Ways to improve maybe the following.
The slant in the building is one drawback in this image which weakens the right angle theme a bit and just the overall strength the building is supposed to portray. Of course any tilt of camera in relation to building will do this on a wide angle approach and only TS lens or a higher angle for you to shoot from could help for this.
You chose a time of day that worked for the image and cant say the light is all that bad except for the sky itself which with a bit more TLC in the PP could have helped to make that part of the scene not as bland as it currently is. It looks flat and further causes the potential punch of this image to be swayed to a lesser level of image. Challenging light requires a bit more work in PP. The contrast between sky and reflection makes it more of a challenge.
The comp itself could maybe have been improved slightly by playing around with moving around the points of intersection... That is where building enters and exits frame of image. Especially on top part of the frame and by creating further right angles in this imaginary way, if you follow what I mean, the general feel of the image could have been enhanced... And the slant of the building maybe even downplayed a bit.
Either way, it remains a shot with lots of potential and focus, exposure was handled well and surprised by depth even at 6.3. Not sure of the growth at bottom suffered on the focus end and cant judge on this scale but I would have been inclined to shoot at a closer stop to be sure the DOF is good.
Meets the challenge, and I like how the building darkens the sky and it shows just a little bit of the tree in the light and the rest is reflected in shadow. Really interesting overall.