I'm not aware of anyone else creating it, though I haven't really looked. These particular miniatures are created using 3D software called Daz Studio. It's a free program, although almost all the models and resources cost money to buy (don't ask how much I've spent on it). The software allows an artist to pose models, alter their shapes/features/sizes/etc... through applicable native parameters and morph presets (some of which have to be purchased). Separate clothing/wardrobe models are used for obvious reasons. Although most models come with a variety of texture presents (up to and including bump, specular, and displacement maps), photoshop savvy artists can edit the textures to create more customized outfits/people. When I've assembled a character the way I like with applicable clothing, props, adjustments, etc..., I have Daz Studio render the image, and then I put it through post-processing in Photoshop to fix glitches/errors, do color and brightness balancing, add shadows, outlines, and other tweaks to make it fit for use in Roll20's tabletop. It's an extremely ideal program for aspiring artists to mess around with, though there is a bit of a learning curve.
