Choose the constraint that mattered
A restaurant might print a fresh menu every morning on an office printer. Start there. Explain why you chose two paper sizes and a typeface that remains readable in greyscale. A design decision with a reason tells a client more about your process than six similar photographs.
Make the comparison legible
Show one detail before and after at the same scale. Add a caption explaining the change. Distinguish your contribution from the photographer’s or developer’s work. If you cannot share client materials, make an anonymous reconstruction and label it as such.
Use evidence you actually have
If the client measured how long a menu update takes, give the measurement and say how it was taken. Otherwise show the editable template or describe the print test. Finish by naming the kind of commission for which this experience is relevant.
Show the decision behind the screen
In a booking website case study, put the earlier screen beside the delivered one. Highlight a single detail, such as moving the date picker ahead of personal details. Describe the observation that changed your mind and the constraint you kept. If other specialists worked on the project, name the part you owned.
Choose an outcome you can document
With the client’s permission, state the period, data source and comparison method. If you only ran a user test, describe what you observed. For example, three participants booked on the prototype without asking where to choose the date. End with a lesson another team could apply and the kind of commission this example helps you take on.