img {  
  text-align: center;
  width: 100%;
  height: auto;
  display: block;
  position: relative;
}

img:before {
  content: "この画像はリンクが切れのため表示できませんm(_ _)m";
  font-size: 12px;
  display: block;
  margin-bottom: 10px;
  color: #333;
}

img:after {  
  content: "\f03e" " " "(image-url: " attr(src) ")";
  font-size: 13px;
  font-family: FontAwesome;
  color: #CCC;
  display: block;
  position: absolute;
  top: 26px;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}