I found a nice Roman sculpture scanned with an Artec 3D scanner.
I edited the file for 3D printing with MeshMixer. I made it solid and fixed the bottom by adding some volume and cutting a flat base. I also scaled the model down.
The original file is here: https://viewshape.com/shapes/pxsfc6l4kz0
The author marked this model as their own original creation. Imported from Thingiverse.