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The design is very nice and clear. I think that in this type of service the most important thing is how will you show the artworks. Do you have a display option with all the other boxes hidden? Something like behance is offering. I think that this kind of preview would be very useful. Also, I would make the text columns a little bit narrower (not much, maybe 10 pixels or so) to give more space around them - it seems to me that typography would work better then.
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Yes, find a artwork and in the single artwork-view click on the image (it's called lightbox - i guess)