The scene composition and character's pose.
In HS you can build the pose as you like and save it in a .png file that we call "scene file", then anyone that have the same mods as you can load it on their computer and edit it as they like.
We have a channel dedicated to sharing scene files for the community.
Using a pre-built scene is kind of a common thing, I do that sometimes when I'm having a creativity block or can't get that particular pose right.
This is the scene file in question:
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It's a really old scene tho... Here's some other works from the same creator, using his flagship character:
inb4 "That's Fanora from MM!!!!"
No it isn't.
And just to be clear, I'm not accusing anyone of stealing anything, I'm just clarifying stuff.
I would be a massive hypocrite if I did that.