In Vinismo, we try not to use copyrighted content under the notion of fair use, because we want our users to redistribute our content freely, and "fair use" doesn't allow that. All our content has to be compatible with our copyleft licence.
The only exception to that rule is wine labels, because they're necessary to illustrate specific wines. There's just no other way - except in the case where their copyright holders (i.e., wineries) upload their labels on the site themselves and choose to do so under our copyleft licence.
You are encouraged to add images of wine labels when creating wine description pages, typically in the "quickbar" section - see How to create wine pages. These labels can be either downloaded from the Web or scanned from actual bottles. We could really use a bottle-shaped scanner, by the way! :)
edit Adding a fair use tag on wine labels
When you add a wine label image file, don't forget to use the "fair use" tag by typing {{fair use}} in the image description. This will add to the image description page the fair use template shown below: