Hi Martin, hope this isn´t too late to join some comments, althought month after first post
Firstly- it looks pretty good, I like the atmosphere achieved with fine color composition and lighting. These are what I would improved:
-those lawn borders are too regular- either make them irregular or add kerbs to prevent grass grow in the sidewalk
-some wooden textures are mapped wrong- It is best seen on wooden stairs-there is neat trick in Blender to correct this- you can rotate object in straight horizontal or vertical position, then press Ctrl+A - Apply size and rotiton. Texture mapping justifies to this position. Then rotate this object back to diagonal position. There is also Texture space rotate tool but I recently can´t remember where it is, never used it before...
And of cource there is always UV mapping, which is the most precise texturing approach and pretty fast in Blender now
-dirt up those textures, there are all just too clean and artifical
-shadows are to crisp for outdoor lighting- adjust soft shadows on Key-light
Other then this, good work, looks really nice