The look of the building is pretty good, but the longer I look, the more I realise it has a very small living space. The wall texture needs more variety, as does the outside floor. Why can we see through the rightmost windows to the landscape behind? It looks like the garage is way too short, or there is no roof to cast a shadow on the rear wall. I agree with RainerS, the second image is the better because of the lighting and colouration, but obviously the background needs work to make the building sit well.
The alpha trees and plants do not work, the light direction doesn’t match the building, or each other. The trees are also way too big compared to the building. Try using the add sapling addon to make several different trees.
I’d stick with the building, I like it, you just need to work on the background and foreground, and… switch to cycles!