If you want to make it act like a block, ever useful
.somewhere img { display:block; }
it's good. (As noted above, it must be a descendant of a block level element, but it can be any level higher, obviously, so you don't have to do this all the time:
<div><img></div>
If you have a link around the image, you can make the same screen: block, as described above, into element a .
a.somewhere, a.somewhere img { display:block; }
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