Baby Yoda lithophane. STL generated on 3drocks: http://3dp.rocks/lithophane/
No supports. White PLA with 0.12mm layer height. 100% infill. No supports, but might want a small brim depending on how good your bed adhesion is.
If you decide to scale it up in your slicer without creating a new STL, just remember to NOT scale up the Y axis (front to back of the litho aka depth). If you make it thicker, then less light will get through and it won't look very good. So just scale up the X and Z axis (width and height).