How to get realistic textures

![alt text][1] [1]: /storage/temp/26979-curtain.jpg So i was wondering what i had to do in order to make my game have realistic graphics. I use the image above as a curtain but in unity it doesn't look quite as good. Im using an hd realistic looking texture, but it doesn't look as good like i said. Is there a way or some sort of shader that i have to use in order to make it look right.