Full Text Databases generally provide the pdf for articles in your results list. However these databases also contain records of articles published elsewhere. You may be able to access these articles by clicking the Full Text Finder button, provided we have a subscription to the journal they are in.
A handy guide to Photography resources on Artstor can be found here.
This tutorial covers basic search techniques in the following databases:
You can apply similar techniques in other databases, but the initial search screen may look different.