1. A computer-implemented method comprising: generating a composite image that includes an element image, the element image being selected from a library, the composite image comprising a composite image resolution and first physical dimensions representative of a presentation area physical dimensions of a defined physical presentation area depicted in the composite image, the library comprising a plurality of element images and also comprising one or more second physical dimensions representative of object physical dimensions of at least one object shown in the element image, the generating of the composite image comprising rescaling the element image based at least in part on the first physical dimensions and the second physical dimensions to size the element image according to a scaling dimension of the element image relative to the presentation area such that the at least one object shown in the element image is included in the composite image with its object physical dimensions adjusted to a same scale as the presentation area physical dimensions; tracking placement parameters related to inclusion of the element image in the composite image, the placement parameters comprising a location within the composite image and the scaling dimension; presenting the composite image to a subject, the presenting occurring via a display device; recording a metric indicative of subject attentiveness to one or more locations in the composite image; and correlating the recorded metric indicative of subject attentiveness with the placement parameters comprising the location within the composite image and the scaling dimension to characterize a level of subject interest in the element image; wherein one or more of the generating, the tracking, the presenting, the recording, and the correlating are performed by a system comprising at least one processor.