Current Update, Feb 9: It seems that the artworks created with the DA stock models have been taken down from all sites. This is good news! I hope the artist will be in touch with the models they have used. It seems possible through what I've heard from these models in their research that this artist may have found these images on a 'free stock' site. Please be aware of any site that is set up with a huge variety of fabulous, high quality images for commercial use, for free. If it sounds too good to be true, it probably is.
An Italian artist has been using stock images from DA's portrait models as the source of her professional work without notifying the models or crediting them. In most cases, these models do not allow commercial use of their stock without permission.
Here is a list of models discovered to have been used so far.
(user is no longer active but this deviation used and credited the same stock) used in
RobynRose was the first to notice the use of her image without permission.
I suspect that since so many of these works share a similar source it is likely that many others in the gallery have their source in DA's stock galleries.
This is a serious matter to which I would like to bring more attention. If you are using someone's face in your artwork, be sure you have that person's permission before you go about selling it.