Look at the spread
Identify the dominant image, the supporting text, and the space between them. Their arrangement can imply a relationship without explicitly stating it.
Distinguish the voices
Separate the biographer's narration, a documented quotation, and a reproduced item. Each should be read according to what it can support.
Return to a work
Choose a related creative work and examine it directly where available. The biography can provide a route into close reading while leaving room for a different interpretation.