Looks good so far!

The big question is what do you want the image to convey to the viewer? What is its purpose?

- Are you trying to show an accurate representation of the proposed materials?
- Do you want to show how the building looks in a particular direction of light? (Morning/evening)
- Is it an image to show to a builder to help him get an idea of the scheme, or a sales image which gives a good impression to potential buyers?
- Do you want to get a feeling of immersion in the scene, or are you happy just showing an orthographic projection?
- Do you want to show how the building sits in relation to its surroundings?
- etc etc...

It's difficult to give any specific advice until you know what you want to achieve.

You may get more responses if this was moved (by a kindly moderator) to the 'Presentation - Rendering and Multimedia' section of this forum also.

I hope that helps!