Create a repeatable setup
Choose a fixed subject and stable light. Record position and settings for each frame. Repeatability helps distinguish what an adjustment changes from what happened because the scene moved.
Arrange a comparison
Place three versions side by side and describe the differences in focus, brightness, or framing. Name the version that best serves your purpose and explain why.
Choose the next exercise
Use the uncertainty in your comparison to plan another small test. A useful workbook accumulates decisions and questions rather than only technically successful images.