Hi sara martin,
I took a quick look at your site just now. The overall design is fairly clean and unobtrusive, although the branding is quite generic. Generally speaking, though, the site does a reasonable job of selling the templates.
Here are some points I picked up on:
That "Need Help? Click to Chat!" popup appears in the top left hand corner by default, obscuring half of the site logo.
The logo has jagged edges around the letters. I suggest redoing the logo with smooth edges.
The page takes a long time to load, primarily due to the file sizes of the large number of template thumbnails on the page. Take a look at the Page Speed report to see how you could improve load time:
http://pagespeed.googlelabs.com/#url=http_3A_2F_2Fwww.templatemagician.com_2Fcategory_2FJoomla-templates&mobile=false "Art & Photography Templates" in the right-hand Categories list wraps, which looks unprofessional. Same for "Interior & Furniture Templates".
Your page copy has a lot of grammar and style errors (written by a non-native English speaker?). Again, this looks unprofessional.
Hopefully that's enough to start with. Please let us know if you'd like more detailed feedback.
Cheers!
Matt
--
Matt Doyle, Elated
3rd Edition of my jQuery Mobile book out now! Learn to build mobile web apps. Free sample chapter: http://store.elated.com/ 
