Help! Detailing >_<

[Fogy]

Please help me out, I have been making levels for 2 years, I can do loads of different styles and levels but theres 2 things I can not do!

Could somebody show me how to detail levels and make houses look better? I have posted a level I made, its very simple, I have added the best house I could make and 'normal' detailed grass around it.
Can somebody please show me how to detail and make houses 'like a pro'?

I have been working on levels for 2 years and still can not do detail and houses.

I have posted a screenshot and level here.