Here is Rihanna bust 3D model ready for 3D printing. The model current size is 5 cm height, but you are free to scale it.
Zip file contains obj and stl.
If you want the version with texture it is available here: https://www.cgtrader.com/3d-print-models/miniatures/figurines/rihanna-ready-for-full-color-3d-printing
The model was created in ZBrush.
I encourage you to check my other celebrity 3D models.