A visual schedule works when it sits at the student's eye level on a path they already walk, when the student is the one who moves the card, and when checking it is a taught routine with a consistent cue rather than something an adult announces. Placement, ownership and a cue. The picture set matters far less than any of the three.
We do not run a special education classroom, so this is not a diary and it is not clinical advice. We read the practitioner pages that hold the first page for "visual schedule classroom special education how to use," kept their names on their ideas, and put them in the order a schedule actually gets built. Where a claim is about evidence rather than practice, it is sourced to the review it comes from.
What the research says, and what it does not
Visual supports are on the list of focused interventions that met evidence-based practice criteria in the 2020 systematic review published by the National Clearinghouse on Autism Evidence and Practice at UNC's Frank Porter Graham Child Development Institute, on 104 single case design studies and 2 group design studies, across ages 0 to 22, with outcomes reported in academic, behavior, communication, social and vocational domains.
What that does not say is that hanging a schedule on a wall does anything. The studies are of taught, prompted and faded use. Every failure the practitioners below describe is a failure of the teaching, not of the pictures.