Read books that follow a certain theme together, around the same time (i.e. trains, pets, construction, dinosaurs.)
This will facilitate an easy compare & contrast discussion as you ask your child to tell you what similarities they see between the books, and then can evolve to a more in-depth analysis of the stories and pictures.
I'm Katie Storey. I'm a former elementary school teacher (4th grade was the grade I primarily taught) & I love reading!