Images in excerpts not showing

I have seen a number of related posts about images not showing in the excerpts page of a WP blog. Not sure why this is such an issue, but I am certainly experiencing it. On my personal blog http://georgevlismas.com I have a blog page that contains images related to the particular post. I installed a plugin "Homepage Excerpts" that allowed me to show excerpts of posts on the home blog page....and although this worked...the relating images were not shown. So I installed another plugin, "Thumbnail For Excerpts" which I hoped would resolve this....but not so. Not sure why this is not working. Is this a theme thing?