The item previews are horrible in most cases. For example the sails, you see the main sail but that's it. You have no idea what the others look like and usually they do not look that good. Same with clothing, hair and such, you can see the front but you won't get the whole picture and you can't see how say a shirt looks with the pants and shoes you have on since it zooms to the upper body and you can't zoom out.
But the thing that bothers me the most is the stuff at the emporium. I'd have to spend coins on items that i can't see properly like for example hulls. The color theme is roughly visible but the images don't show nearly enough for me to spend money on them. I tried to look some of them up but in many cases all i found was clips or images of galleons. The difference can be sometimes quite big depending on the ship model so i just won't take a shot in the dark.
Could it be possible to add proper previews at some point? Rotatable images of the whole ship and every model so you'd actually see what you are paying for. I already spent money on one that didn't look that great on a galleon so i'm not gonna do it again.