Related Posts Thumbnail V2

add the above </head>

<script type='text/javascript'>
//<![CDATA[
var relatedTitles = new Array();
var relatedUrls = new Array();
var relatedpSummary = new Array();
var relatedThumb = new Array();
var relatedTitlesNum = 0;
var relatedPostsNum = 4; // number of entries to be shown
var relatedmaxnum = 75; // the number of characters of summary
var relatednoimage = "https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOnU0f9VHjClL6rM-WKAID_BWFMOqYy1MHeb1CIm91-dWH8994rtQNVRlyTRUtrIdDXgb8QqMy52DBWuEniyGPvdTEgy92uuHQO3Ic6R2jqFq-4KrQK_WXANA4b1XHIEcNwhO9CYNHxstp/s1600/no_image.jpg"; // default picture for entries with no image
function readpostlabels(e){for(var t,r,l,a=0;a<e.feed.entry.length&&(t=e.feed.entry[a],a!=e.feed.entry.length);a++){relatedTitles[relatedTitlesNum]=t.title.$t,l="","content"in t?l=t.content.$t:"summary"in t&&(l=t.summary.$t),relatedpSummary[relatedTitlesNum]=removetags(l,relatedmaxnum),r="media$thumbnail"in t?t.media$thumbnail.url:relatednoimage,relatedThumb[relatedTitlesNum]=r;for(var d=0;d<t.link.length;d++)if("alternate"==t.link[d].rel){relatedUrls[relatedTitlesNum]=t.link[d].href;break}relatedTitlesNum++}}function showrelated(){for(var e=new Array(0),t=new Array(0),r=new Array(0),l=new Array(0),a=0;a<relatedUrls.length;a++)contains(e,relatedUrls[a])||(e.length+=1,e[e.length-1]=relatedUrls[a],t.length+=1,t[t.length-1]=relatedTitles[a],r.length+=1,r[r.length-1]=relatedpSummary[a],l.length+=1,l[l.length-1]=relatedThumb[a]);relatedTitles=t,relatedUrls=e,relatedpSummary=r,relatedThumb=l;for(var a=0;a<relatedTitles.length;a++){var d=Math.floor((relatedTitles.length-1)*Math.random()),n=relatedTitles[a],s=relatedUrls[a],m=relatedpSummary[a],i=relatedThumb[a];relatedTitles[a]=relatedTitles[d],relatedUrls[a]=relatedUrls[d],relatedpSummary[a]=relatedpSummary[d],relatedThumb[a]=relatedThumb[d],relatedTitles[d]=n,relatedUrls[d]=s,relatedpSummary[d]=m,relatedThumb[d]=i}for(var u,h=0,o=Math.floor((relatedTitles.length-1)*Math.random()),g=o,f=document.URL;h<relatedPostsNum&&(relatedUrls[o]==f||(u="<div class='relatedsumposts'>",u+="<a href='"+relatedUrls[o]+"' title='"+relatedTitles[o]+"'><img src='"+relatedThumb[o]+"' /></a>",u+="<h6><a href='"+relatedUrls[o]+"' target='_self'>"+relatedTitles[o]+"</a></h6>",u+="<p>"+relatedpSummary[o]+" ... </p>",u+="</div>",document.write(u),h++,h!=relatedPostsNum))&&(o<relatedTitles.length-1?o++:o=0,o!=g););}function removetags(e,t){for(var r=e.split("<"),l=0;l<r.length;l++)-1!=r[l].indexOf(">")&&(r[l]=r[l].substring(r[l].indexOf(">")+1,r[l].length));return r=r.join(""),r=r.substring(0,t-1)}function contains(e,t){for(var r=0;r<e.length;r++)if(e[r]==t)return!0;return!1}
//]]>
</script>


<style>
.relatedsumposts {
padding: 0px 10px;
text-align: center;
/* width of the related posts area */
width: <b>120px</b>;
float:left;margin-bottom:15px;
border-right: 1px dotted #E5E5E5;
display: inline-block;
}
.relatedsumposts h6 {
margin: 5px 0;
}
.relatedsumposts h6 a {
/* link properties */
color: #linkcolor;
text-transform: uppercase;
font-size:12px;
}
.relatedsumposts img {
/* thumbnail properties */
height: <b>82px</b>;
width: <b>82px</b>;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;
}
.relatedsumposts p {
/* summary properties */
border-top: 1px dotted #E5E5E5;
border-bottom: 1px dotted #E5E5E5;
color: #summarycolor;
font-size: 10px;
height: 4em;
line-height: 1;
margin: 5px 0 0;
padding: 5px 0 15px 0;
}
#relatedpostssum {
width: 100%;
}
.relatedpoststitle {
font-size: 19px;
margin-bottom:15px;
}
</style>



Search the code <b:includable id='postQuickEdit' var='post'> on your template

on it there </b:includable> and paste the code above

<!-- Related Posts with Thumbnails Code Start-->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<b:loop values='data:post.labels' var='label'>
<b:if cond='data:label.isLast != &quot;true&quot;'>
</b:if>
<script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=readpostlabels&amp;max-results=50&quot;' type='text/javascript'/>
</b:loop>
  <div class='post-footer-line post-footer-line-4'>
   <div class='relatedpoststitle'>RELATED POSTS</div>
<div id='relatedpostssum'>
      <script type='text/javascript'>showrelated();</script>
    </div>
    <div style='clear:both;'/>
  </div>
</b:if>
<!-- Related Posts with Thumbnails Code End-->



 DEMO : 
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