1. Add multiple light sources in the rendering environment by accessing the lighting settings in your rendering software. Use the 'Add Light' option to introduce new light sources, and adjust their properties such as intensity, color, and position to achieve the desired effect. 2. Use the iteration tracking feature by enabling the version control system in your design software. This feature allows you to save different versions of your design, label them appropriately, and track changes over time. Senior designers can review these iterations to ensure consistency and quality. 3. Add a descriptive change logging mechanism by integrating a change management tool that automatically records modifications made to the design files. Alternatively, maintain a manual log where designers document each change with a description, date, and reason for the modification. This log should be stored alongside the design files to comply with industry standards like ISO 13485 for medical devices.