I took this of a buildning not far from my house. I took one a couple of weeks ago and the trees hadnt bloomed yet now they are blooming don't you just love spring.
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Image seems more about the foliage than the building in my opinion.
Perhaps a little more angle on the building would help the composition.
As a suggestion, try taking the image into Photoshop (assuming you have it), and in the Hue/Saturation adjustments, take the yellow channel hue and saturation to the right a little (may 10 pts) and bright the lightness down a bit (10-20 pts) to give the yellows more of a darker, richer green look, and bring the red saturation up just a little.
the trees make it hard to see the subject, maybe next time shoot the house on a side where the trees don't obstruct as much.
the sky needs more color, i would suggest a polarizing filter.
also, the subject is in the dead center of the picture. try the rule of thirds next time.
The photo looks washed out because of the contrast from the sun/sky. I also find the trees to be very distracting and takes a lot away from the building. I'm also not fussy on the size you have chosen (640x640). I find it gives an unnatural perspective to the photo. Good luck in this challenge.
You've got a good idea going here. Catching the foiage/trees does ad some interest and nice vivid green coloring here, but in this case it might be just a bit too much. Seems to be kind of obscuring your main subject a little too much. Perhaps also framing out a bit of the foreground grass might help some too. Maybe keeping in mind the idea, but finding a different angle/perspective, showing more of the structure, but still with some trees/greenery would make for a stronger photo.