If you are not working in a group, share the first draft of your infographic with a trusted peer or colleague. Ask them for feedback, possibly with reference to the Infographic Creation Guidelines (see part 5.2 below, for specific tips on providing feedback as a teacher).
If you are working in a group, consider doing a gallery walk. For a classroom-based example, see Jim White’s lesson on prepping for a gallery walk (DOC), and on providing peer critiques in a gallery walk (DOC).
See also a peer review activity that focuses on the visual representation of the infographic rather than just the text. Audience Feedback for Infographics (DOCX)