SurveyWriter now allows respondents to upload images into a survey. This means you can have a respondent take a picture of whatever's within the reach of a mobile phone camera and not only save these images but also use them later in the survey.
For example, you can have the respondent compare the uploaded image with existing images, rate the image, or answer open ends about the image. Multiple images can be uploaded together. Respondents can take photos during a survey or they can just select an existing photo.
Upload Images Into Survey