How about giving flyers out on cafe`s, hang them up on boards etc in your local town or something... contact some art galleries aswell, maybe they are interested to have such fliers in their gallery info desk or something like that.
Well, I would say to join art related forums where people are interested in that sort of subject and post around about it. Or submit a site map to google, buy some text links or advertising off devianart I think its like $25 a month.
You just need to focus on expanding the current traffic to a much larger audience. Offer some unique content submit it to digg whatever and drive up traffic.
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