@BillYo414 posted:People and organic shapes are tricky in a lot of the software used to make the designs you see in that library. Lamp posts, machines, and even most locomotives are easier because of their lines or straight or circular. Humans tend to have tricky lines that would take a long time to draw in common CAD programs like Solidworks, AutoDesk, etc. I think Rhino and Fusion 360 do "organic" shapes but I'm not exactly sure myself.
Having a 3D scanner would be the other option but some of us don't have a 3D scanner (yet!).
They're actually surprisingly easy to make with a program such as the free Makehuman (there are also similar commercial programs). Creating poses for them is a bit more challenging, but certainly easier than creating a person from scratch. Their poses can easily be edited in the free Blender 3D software.
These are a dining car staff I created in "Makehuman" (tray, hat and frying pan created in 3D program and added to figures).
More figures I created in Makehuman and then printed. Cheap Chinese purchased figures in box for comparison.
These are Makehuman figures I printed and then painted...
