Wow, let me first off saying that is amazing turn around.. I’m impressed!
Regarding the <H> tags, for SEO:
Currently, for category page (http://demo.templates-master.com/a004/electronics/digital-cameras), the template has:
<h3> shop by
So the most important header tag is wasted and the products don’t show up in any of the tags.
A suggestion would be:
<h2> product name
<h3> product short description bullets
and for product page:
<h1> product name
<h2> product description bullets
<h3> product detail bullets