Edit in JSFiddle

$('.front').click(function(){
    $(this).toggleClass('rotation-animation');
});

<img class="front rotation-animation" src="http://lorempixel.com/100/100/people/" >

img.front {
    transform:perspective(1000px)  rotateY(0deg);
   
    margin:0;
    display:block;
    width:320px;
    height:320px;
    margin:100px auto
}

.rotation-animation {
    animation:my-rotation 2s infinite;
}

@keyframes my-rotation
{
    50% {
          transform:perspective(1000px)  rotateY(180deg);
    }
    100% {
         transform:perspective(1000px)  rotateY(360deg);
    }
}