1. A computer-implemented method for indicating one or more reflective product areas in a displayed image of the product the method comprising: obtaining a markup language description of a product image, the description comprising one or more non-foil content layers with markup language components describing content corresponding to non-foil regions of the product image, and one or more foil content layers corresponding to one or more reflective regions of the product, wherein each of the foil content layers are assigned via the markup language description to different z-index values than the non-foil content layers; for each foil content layer, generating a plurality of image variations of the corresponding foil content layer and associating the plurality of image variations with the corresponding foil content layer, the plurality of image variations generated by applying a gradient function to one or more fixed groups of a plurality of pixels in the corresponding foil content layer, the gradient function comprising a same mathematical function applied to each fixed group of pixels to relatively increase or decrease respective intensities of the pixels, each of the image variations being generated with the same gradient function applied at a different offset position, each offset position resulting in varying the intensity of different pixels in each of the one or more fixed groups of pixels; and providing the markup language description and each of the non-foil content layers and the foil content layers and associated image variations to a user computer for assembling all of the non-foil content layers and the foil content layers in the user's browser according to the z-index values assigned to the respective layers in the markup language description of the product image, the markup language description providing instructions to the user computer to sequentially display the corresponding image variations of each of the non-foils layers such that the effect of light motion on the one or more reflective areas of the product is represented in the product image.