There is some advantage in just advertising wherever, in that it helps to spread your name and make more people aware of your presence; but it probably won't earn you very many sales for your advertising dollar.
I'm not sure whether you mean the quality of your images on-line and the facility for your targeted customers to zoom in and see your graphics in detail.
If this is the case, yes for sure customers want to see a good representation of your product to enable them to buy with confidence.
I totally agree with Rodney if you are marketing your product you must first define your market. Who are your prospective customers, why should they buy from you rather than the competition, what's your point of differentiation?
Are your graphics outstanding? What are the benefits of customers buying your Tees? Where are you likely find these customers? Can you build links to your site to attract these customers? Can you get past customers to recommend and refer you to others? What added value can you give to your customers?
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