Adding photographs to an evaluation report can make it more appealing to readers and also make the key messages more memorable.
Practical and ethical issues need to be addressed. Planning ahead is important to ensure that photographs of key events, or of the situation before an intervention, are taken when needed.
If people can be identified in the photographs, their permission will be needed to take the photo and to use it, and to add their name to the caption. There are particular sensitivities around including photographs of children. If the photos are not yours, ensure you have permission from the photographer to use the photograph in the ways you are planning – including permission to use it in different media (a written report, a presentation, a website) and to edit the photograph (for example, cropping it).
In addition to, or possibly instead of, taking photographs just to illustrate the report, consider whether photographs might be a useful option for data collection, which is then analyzed and reported like any other data. This can be done in a participatory way. (see Photography/Video recording, and Photovoice in the options for Collecting/Retrieving Data)