So ive broken down a few of this persons cards, and this is a common occurrence. Most of his/her stuff seems to be either based off PS or Mr Skins work
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Im not saying everything they have made is by someone else, but i raise an eyebrow at the similarities.
In short, i can safely say Perseus Stoned created this Janet card and not the reuploader at kenzato, creators that make many cards have some creation tells that they always seem to do, for example slider values on a face, certain upscaling values used in the face, head etc, this Janet card shares many of PS telltale slider values.
PS used to post here way back in the day and started his patreon based off suggestions from users at f95. I subbed to him for about 15 months, i know his work at first glance. I also greatly respect his talent and know how long it takes him to create some of his cards, some 2-3 months to make. Getting a bumpmap perfect takes a alot of reediting and remaking, its time consuming.
Bumpmaps let you finely tune details under the skin, on bodies this can be ab definition as example, creators often use bumpmaps to combine multiple face or body effects into the same texture so they can do more in the editor
For example, gaunt cheeks, puffy lips and laughlines on the bumpmap and then in creator add eye effect 2 and Nyacho face wrinkle as example.
It lets you make faces/bodies that are impossible to achieve without the bumpmap and they can add alot of options to the creator, when used correctly.
With Hs2 material editor on a face you can add 3 additional bumpmaps to a face, bumpmaps can also be used on clothing and often is by modders
- Bumpmaps 1, Bumpmap 2 and Texture 3 are the most common used in hs2 by advanced creators
Then there is occlusion and detail skin mask, these enhance the bumpmaps even more, at the tradeoff of a larger file size on the card
If your curious how to make them, you will need photoshop, Gimp or blender and would want to youtube quite a few videos to get started
Heres an example vid on simple creation
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as well as a much more professional explanation then my ramblings lol