I generated a 4 color STL of the Dragon decal with the amazing HueForge program. I used blue colors but you can use any color combination you want but it is recommend to go from dark colors to light colors. if you interested in how I made this file you should check out HueForge its very affordable and only takes some messing around to get used to the program and make amazing looking prints.

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
Polylite Black Transmission Distance: 0.3
Polylite Azure Blue Transmission Distance: 3
Polylite Aqua Blue Transmission Distance: 2.5
Polylite Cloud White Transmission Distance: 6

Swap Instructions:
Black until layer #4 at 0.4mms
Azure Blue until layer #5 at 0.48mms
Aqua Blue until layer #12 at 1.04mms
Cloud White until layer #17 at 1.44mms

The slicer software I used was Bambulab and the printer is the Bambu X1 carbon with AMS.

Keep and eye out if your interested in more HueForge models I plan to upload many more.

Thanks

V2:

I made a V2 in red and yellow colors because I wanted to tweak some layer heights and how that you can use any color you want for these models.

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
PLA Polylite Black Transmission Distance: 0.3
PLA PolyLite Red Transmission Distance: 1.5
PLA PolyLite Yellow Transmission Distance: 11
PLA Polylite Cloud White Transmission Distance: 6

Swap Instructions:
Black until layer #4 at 0.4mm
Red until layer #7 at 0.64mm
Yellow until layer #13 at 1.12mm
Cloud White for the rest.