Lithophane created using the online https://3dp.rocks/lithophane/ tool to create the STL file.
You can print one too, of any photo you like. Follow the instruction I previously provided in:
https://www.printables.com/model/446828-wonder-woman-gal-gadot-lithophane
White PLA
0.4 MM Nozzle
0.16 Layer Height
The author marked this model as their own original creation.