original post removed.
Nice design.
Note that the Blog link at the bottom refers to 404 page.
Empty wishlist does not look good
http://www.artenet.es/wishlist-view/
Please also check Validate certificate block here:
http://www.artenet.es/giftcertificates-add/
Also we see javascript error:
Do not forget to change copyright information:
Yeah very nice design, just a site note - do you sell to non native speakers as well, if so you may want to add a second language.