Clip Studio Paint can utilize 3D models.  
Characters are Poseable down to individual fingers.  Everything can be scaled, rotated and positioned to be used as a reference for drawing.

There are many items and characters available from the Clip Studio Assets store, and a lot of poses.  B ut did you know you can actually imprt your own 3D models into Clip Studio Modeller and set them up to be used in Clip Studio Paint??

The process requires knowldege of 3D software, and of course... it requires you to HAVE the 3D software.  
I personally use Blender.  It is free, it is powerful it is amazing.

Again, there are about a million videos on YouTube about how to use Blender, but if you have trouble following CSP instructinoal videos, 3D i seven more difficult.  Plus there have been many updates to Blender, so the videos on YouTube are mostly using outdated versions of th esoftware, and while it's all still there, it just looks competely different and may be accessed from a different menu/location.  It's very confusing.  

I come from a 3D modelling background, and played with Blender for years in college while I was persuing a career change, so I'm passable as a 3D object creator, and mostly functional in Blender.  If you download it, I wish you the best of luck.  Perhaps when I'm happy with my Clip Studio instructional site, I'll dive into Blender.  Who konws?  

But for now, try out Blender.  Or download free 3D meshes from the internet and try to import them. 
I have downloaded free meshes, and I warn you, some behave better than others once imported into Clip Studio Modeller.

FYI:  Modeller is not a priority for me on this site, so I may or may not have anything new here for quite awhile as I work on the other pages.