Hi
Before you go into photoshop you need to get the render sorted... there are quite a few bits you can improve.... the render looks flat, you can work on your materials, there is a lot of white bits have a look at changing some of them... roof edge detail, soffit, render, render grooves..... the glass needs a bit of work, and there is an odd tilling to the grass to the front copy 01 image ... on the left......
Look at getting a camera and photographing your own people... with the right sun position, this will help bed them in.... perhaps you should put them on the path.......... you need to blend in between the house land and the background too... to sharp. and why have you faded off the background...????
That's just to start...
Lee