1. A computer-implemented method comprising: under control of a computing device executing specific computer-executable instructions, receiving a first image of a human subject and a second image of the human subject, wherein the human subject includes a trunk and legs; generating a normalized first image from the first image and a normalized second image from the second image, the normalized first image and the normalized second image showing the human subject at a common scale; receiving an image segmentation model for segmenting the normalized first image and the normalized second image; generate a first image portion using the image segmentation model and the normalized first image, the first image portion showing the trunk of the human subject; generate a second image portion using the image segmentation model and the normalized second image, the second image portion showing the legs of the human subject; causing the first image portion and the second image portion to be presented via a display; and causing the first image portion to be presented via the display in vertical alignment with the second image portion, wherein causing the first image portion to be presented via the display in vertical alignment with the second image portion comprises: detecting a first pose of the human subject shown in the first image; detecting a second pose of the human subject shown in the second image; identifying a first centerline for the first pose; identifying a second centerline for the second pose; and causing the first image portion and the second image portion to be presented via the display with the first centerline and the second centerline aligned.