There is no shortage of Images of Scarlett Johansson portraying Black Widow in Iron Man 2. Here are three I found and mad into Lithophane STL files. Again the are images were found on the web, Links provided.
Black Widow-Scarlett Johansson-Iron Man 2-a
Black Widow-Scarlett Johansson-Iron Man 2-b
Black Widow-Scarlett Johansson-Iron Man 2-c
There are of course many more to choose form. Just use the Image to Lithophane web sight to create the STL form any image. It is surprisingly easy to create your own.
Printed in White PLA as Positives, so the light behind brings out the image.
100% Infill
0.16 mm Layer height
0.4 mm Nozzle
The author marked this model as their own original creation.