0
Would that be?
img{
max-width: 100%;
}
.figure, img{
position: relative;
}
.figure{
max-width: 842px;
}
.figure img:last-child{
position: absolute;
max-width: 30%;
margin-left: 35%;
top: 20px;
border: 2px solid #fff;
}
<figure class="figure">
<img src="http://msalx.viajeaqui.abril.com.br/2013/07/11/1112/6IivB/kuken-tepuy-timsnell-creative-commons.jpeg?1373556397" alt="" />
<img src="http://msalx.viajeaqui.abril.com.br/2013/07/11/1112/6IivB/kuken-tepuy-timsnell-creative-commons.jpeg?1373556397" alt="" />
</figure>
Only if you pay attention to the size of the image, in my example I am using the same image, that is, both have the same size, if it has different size you will have to adjust according to the need
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