This is using Assetylene v2.0.3 from https://github.com/endevver/mt-plugin-assetylene

Asset Insertion

<mt:Assets>
	<mt:Section strip_linefeeds="1" replace="    ","">
		<mt:If tag="mt:AssetType" eq="image"><mt:ignore><!-- if the asset type is an image, then... --></mt:ignore>
			<mt:ignore><!-- set the variables for alignment and thumbnail size --></mt:ignore>
			<mt:AssetyleneAlign setvar="align">
			<mt:AssetyleneThumbWidth setvar="thumb_width">
			<mt:ignore><!-- div for asset alignment --></mt:ignore>
			<div class="asset-image<mt:If name="align" eq="left"> img-left</mt:If><mt:If name="align" eq="right"> img-right</mt:If>">
				<mt:ignore><!-- if the image is a thumbnail... --></mt:ignore>
				<mt:If tag="AssetyleneThumb">
					<p>
						<mt:If tag="mt:AssetylenePopup">
							<a href="<$mt:AssetURL$>">
						</mt:If>
							<img class="img-responsive<mt:if tag="mt:AssetyleneAlign" eq="center"> center-block</mt:If>" src="<mt:AssetThumbnailURL width="$thumb_width">" alt="<mt:AssetLabel>" />
						<mt:If tag="mt:AssetylenePopup">
							</a>
						</mt:If>
					</p>
					<mt:If tag="AssetyleneCaption">
						<p style="max-width:<$mt:Var name="thumb_width"$>px;color:teal;" class="<mt:If tag="mt:AssetyleneAlign" eq="center">center-block</mt:If>"><small><em><mt:AssetyleneCaption></em></small></p>
					</mt:If>

					<mt:ignore><!-- if the image is full size... --></mt:ignore>
					<mt:else>
				
					<p>
						<mt:If tag="mt:AssetylenePopup">
							<a href="<$mt:AssetURL$>">
						</mt:If>
							<img class="img-responsive<mt:If name="align" eq="center"> center-block</mt:If>" src="<mt:AssetURL>" alt="<mt:AssetLabel>">
						<mt:If tag="mt:AssetylenePopup">
							</a>
						</mt:If>
					</p>

					<mt:If tag="AssetyleneCaption">
						<p style="max-width:<mt:AssetProperty property="image_width">px;color:teal;" class="<mt:If tag="mt:AssetyleneAlign" eq="center">center-block</mt:If>"><small><em><mt:AssetyleneCaption></em></small></p>
					</mt:If>
				</mt:If><mt:ignore><!-- end assetyleneThumb --></mt:ignore>
			</div><mt:ignore><!-- end div asset-image --></mt:ignore>
			
			<mt:else><mt:ignore><!-- if the asset isn't an image do this --></mt:ignore>
			<a href="<$mt:AssetURL$>"><$mt:AssetFileName$></a>				
		</mt:If>
	</mt:Section>
</mt:Assets>