I made this lithophane with the free website https://lithophanemaker.com/
Due to the nature of colored lithophanes your results may vary based on the exact colour and transparency of your filament so your results may be different from mine.
If using the raw files you need to import all parts as a single object, this way the different sections are aligned properly. The different parts are named with their respective color, which can then be allocated to their own ams slot.
Changing the scale of this model will effect how the colored layers mix and may cause it to appear significantly darker and/or off balance the shading of the image.