Hi Alexandra Nicole,
Your shop looks great. The prints are wonderful and there is a nice variety of items. I especially like the about page, it is very interesting and would definitely convince me to buy from you :) As for the listings, the tags seem good to me. The descriptions are not too long in my opinion, in fact I would like more explanation about each print, maybe with a little story behind. You don't say too much about that and it would make the listing more interesting. As an international seller and buyer, I have two remarks - for me it would be useful to have dimensions in centimeters as well. Also, shipping price to Norway seems to be very high, almost as much as the item itself. This is something that would make me thing twice before purchasing. I suppose your prints are not too heavy to ship. And finally, if you need to add more photos to the listing, you could add the ones of the packaging, since you put much effort into describing it (it would be easier to visualize).
Best of luck :)