orange shaded with a colour thats kinda like regal blue+fiery orange or black +white or bleached bone will shade to a more neutral greyed tone...a colour between a true blue and cyan basicly, slight desaturation will help keep the intensity down so that it stays towards grey rather than brown
if you use too strong of a blue it will shade the orange towards brown which isnt as nice
you can also use a green/blue(note more green than blue is my preference, so like scaly green) and purple to get a really colourful orange
bronzed flesh or elf flesh can highlight an orange nicely
you can also glaze in some reds to nuance the orange
heres an image, because of the reflection ive taken two samples, the colour is one or the other or between...the ones on the right are the greyed mix, the ones on the left are the browned mix: