instead of using the provided method i used https://lithophanemaker.com/ which was defiantly a lot more user friendly just upload the photo(s) select the shape and adjust some other parameters if you want wait for it to give you the STL then go ahead and slice it at 100% infill
https://drive.google.com/file/d/1zu_4ddSeFftkDsEIOT_QIjg9VJZ9vwzg/view?usp=sharing <---- here is my stl, it was to big to upload