The images have a brief description that identifies them, and provides attribution to the copyright holder.
The images are only being used as the primary means of visual identification of the subject and for informational purposes.
As screenshots, the images are not replaceable by free content; any other images of the work would also be copyrighted, and any version that is not true to the original would be inadequate for identification or critical commentary.
The images are significant in illustrating the subjects of the articles, facilitating critical commentary as they provide an immediate relevance to the reader more capably than the textual description alone.
The images are of sufficient resolution for commentary and identification but lower resolution than the original. Copies made from them will be unsuitable as artwork on counterfeit goods or other uses that would compete with the commercial purpose of the original work.
The use of the images does not in any way affect the value of the original work or limit the copyright holder's rights or ability to market or sell their product.