For what it is, this is pretty good. White walls and grey roofing challenge the artist.
You've made the color and exposure values quite appropriate and have eliminated the sense of blackness so prevalent on intensely lit scenes like this. It feels like an afternoon in a parched country… but with good lawn irrigation!
Without sounding neurotic, I worry that the foreground tree branch is falling on the building - this needs to be more stable in the composition.
Lastly, compositionally: and this is a personal bias. There is no way for viewers to project themselves into the scene. You've made a barrier to the eye accessing the entrance and seeing a way into the building. We must hop the shrubbery. I feel like a burglar casing a joint. Hope they have their new Mac Pro with the 16GB of 800 mhz DDR RAM bolted down because i plan to nick it. Which window should we put the boots to while standing on the porch?
I personally object to more-or-less equal angle vanishing points - like you have done, because they are ambiguous. I'd like to see you bias the composition by moving the camera location toward the left. This will emphasize the entry and still communicate all of the other design elements.
You work in Archicad 9? If not, replace your sun object with the internal Realistic sun for soft shadows.
Dwight Atkinson