Edit in JSFiddle

<div class="circle">
<img src="http://oi65.tinypic.com/14kxmag.jpg">
</div>
<br />
<div class="smallcircle">
<img src="http://oi65.tinypic.com/14kxmag.jpg">
</div>
<br />
<div class="circle vert">
<img src="http://oi63.tinypic.com/2pzy4ad.jpg">
</div>
<br />
<div class="smallcircle vert">
<img src="http://oi63.tinypic.com/2pzy4ad.jpg">
</div>
body {background: #000;}

/* Circle Border on Images */
.circle {
    width: 150px;
    height: 150px;
    border-radius: 100px;
    overflow: hidden;
    border: 4px solid #FFFFFF;
    background-color: #FFFFFF;
}

.smallcircle {
    width: 75px;
    height: 75px;
    border-radius: 100px;
    overflow: hidden;
    border: 4px solid #FFFFFF;
    background-color: #FFFFFF;
}

.circle img, .smallcircle img {
    height: 100%;
    width: auto;
    margin-left: -25%;
}

.vert img {
    width: 100%;
    height: auto;
    margin-top: -25%;
    margin-left: 0;
}