As what I found checking your site alt text on the images are really missing..they are really important cause robots can read images..by itself you should work on it and then there is no such content describing your products where in you can use in your keywords on it just don't kw stuff...content relevancy is a factor in SE..also you can use content in promoting your site..you should also do more on link building using your targeted keywords by the way the word itself sunglasses do really have a big average on search so you can concentrate first on targeting long tailed keywords..this way you'll be able to stay in the competition..On page review of the site might help and more strategies on promoting your products..

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Search Engine Optimization Tutorials: Seo Query