I am lucky to have 3 large display boards right outside of my room. I introduce my 6th graders to the idea of a 'gallery' when they hang their first project - Self Portraits done as a printmaking unit. I always have a writing component to my major projects and start them off with a very basic form for this project: "Some things I have learned about Self-portraits and Printmaking" that goes on the bottom of the frame. As they progress through the year, they are directed to more insightful writing. In the 'gallery' they have to figure out how to hang works to achieve a balance of images - very basic skills at this point.
In 7th grade I do an Intro to Art Criticism project where they 'visit' a hallway gallery with some prints and musuem labels. They write a critique then the unit progresses to either a gallery done as a power point or actually 'built' using mini prints.