How to eliminate the shadow from a single image?

Twenty Twelve theme: I am trying to eliminate the shadow from a single image using

.entry-content img .no-shadow,
.comment-content img .no-shadow,
.widget img .no-shadow,
img.header-image .no-shadow,
.author-avatar img .no-shadow,
img.wp-post-image .no-shadow {
	/* Add fancy borders to all WordPress-added images but not things like badges and icons and the like */
	border-radius: 3px;
	box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

and

.no-shadow {
	-moz-box-shadow: none;
	-o-box-shadow: none;
	-webkit-box-shadow: none;
	box-shadow: none;
}

It does eliminate shadow from all images, however I want just a single image to appear without the shadow. Where is my mistake?

See my site: biciuliams.lt