I read an article a while back about a guy that was trying to buy a baseball bat for his son. He didn't know what bat to get. He searched dozens of sites. The sites that had some information didn't relate that information to the products. The ones with large numbers of products didn't describe the bats well enough to know what he was getting.

Here was a customer that wanted to spend money on the right product. But the sites provided no help in that regard. The guy decided to buy something else from a different site and give up on the baseball bat as a gift.

What he discovered was 3 items that made the difference. What makes one product different than the others? Your site suffers in that regard. Are the only differences price and appearance? That seems to be what you are suggesting with the site. If so I'd just sort the entire catalog by price low to high and find the one that I like the looks of. Even if I might be happier with a more expensive pair. But I don't know that based on the lack of info about the products.

So the article related 3 items that are often overlooked. Features, benefits and results.
Features: describes various attributes of each product. Polycarbonate lens, acrylic lens, metal hinges, ultra light weight, scratch resistant coating etc.
Benefits: What are the advantages of this feature vs other choices? Polycarbonate lenses, polycarbonate is one of the most durable lens materials available. Metal hinges are much stronger than plastic molded hinges. etc.
Results: What are these benefits going to mean to the average user? Polycarbonate lenses tend to last longer than cheaper lens materials. The little extra in initial purchase price can be easily offset by having the sunglasses last much longer.

Since I started adding this type of information to my sites, I constantly get emails of praising the completeness of my sites. Well, the conversion has gone up at bit but over time sales seem to be more steady and repeat business is great. Once you have a believer they will come back and buy more and more. Having detailed product information adds to the trust factor. It tells the customer that you are serious about the product and care that they know what they are buying.

Another suggestion:
You have a very nice page on face shapes, hair and skin. For each product add which face shape, hair and skin attributes the product was designed to work best for. Then have the site filterable by each of the attributes.
Why would I want to waste my time looking at products that wouldn't be the best for me? Let say I have a round face, light complexion and tight curley hair. Maybe there are a dozen or so products that would work well for me. If I can look at only those I can get to a decision faster and buy. I might even want to buy several different pair for different uses.