Edit in JSFiddle

 /* viewport-width >= 1200 */
            @media screen and (min-width: 1200px)
            {
                  img
                    {
                        height: 200px;
                        width: 200px;
                        background-image: url("http://qnimate.com/wp-content/uploads/2014/06/1024.jpg");
                    }  
            }
            
            /* viewport-width >= 992px and viewport-width <= 1199px */
            @media screen and (min-width: 992px) and (max-width: 1199px)
            {
                img
                    {
                        height: 200px;
                        width: 200px;
                        background-image: url("http://qnimate.com/wp-content/uploads/2014/06/1024.jpg");
                    }  
            }
            
            /* viewport-width >= 768px and viewport-width <= 991px */
            @media screen and (min-width: 768px) and (max-width: 991px)
            {
                    img
                    {
                        height: 200px;
                        width: 200px;
                        background-image: url("http://qnimate.com/wp-content/uploads/2014/06/512.jpg");
                    }  
            }
            
            /* viewport-width <= 767 */
            @media screen and (max-width: 767px)
            {
                img
                    {
                        height: 200px;
                        width: 200px;
                        background-image: url("http://qnimate.com/wp-content/uploads/2014/06/512.jpg");
                    }  
            }

<img>