I agree with the background and the house. Background too close/too big. There are some big trees on behind the house and I was trying to get that to work but I think I over did it for sure.
As for texture mapping the wall - assuming this means giving it a material that works properly - I really struggled with this because of the shape of the wall. That is - beacause the wall curves so much and varies in height from 500mm to 1200mm I had problems modelling it in a way that didn't mess too much with the material I put on it. THere is a ctually supposed to be a double bullnose capping on it but I couldn't get that to work at all. Advice would be greatly appreciated.