Somehow, to make a picture more real is not difficult. Some people use blur tool to make the main picture focused but the other one use a combination of color. These two thing is the usual thing that almost all people do when they tried to retouch their photo.
There is another tool that we can use to make a picture more real. It's a burn tool and dodge tool. Burn tool will make your picture more darken and dodge tool will make your picture more brighten.
Use the burn tool to a dark element of your picture such a shadow, dark side of the door, dark side of the clothes and another dark element. Use the dodge tool to a bright element of your picture such as bright sky, bright wave of the sea, bright side of the clothes and many other.