Thanks for the compliments. Took me what it felt like ages, but the result turned out very satisfactory.
In fact, that colour dilemma was already present during the request. Hxc slightly preferred the elf version but I just had to finish the full colour one to see how it would look in the end. Reducing colours to one isn't exactly hard after all.
Personally I recommend this:
If you want to keep your current elf/demon combo, go with those colours in the set as well.
If you are willing to let go of elf and get platinum instead like shown on the screenshot, do it. The set has more depth and personality in the full colour style.