Will the users be able to purchase products through this site or is the function of the site just to advertise pieces in your gallery?

I think it will be to just advertise as I don't want to have all the extra infrastructure and security to take payments over the site.

Any reference website for inspiration?

Yes there is, here ya go!

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briannamartray.com/

andreageerdesigns.com/

benjaminfrey.com/

anthonyhansen.com

the project is (Uncoded - PSD layout only), what do you mean it needs to be user friendly to update (Wordpress is preferred)??