So colouring I kind of did all at once.. uhm.

pic 1) Putting down the flats for the colour, all the layers set to either ‘soft light’ or 'multiply’ depending on how the colour reacts to light.

pic 2) Painting on top of aaaaaalll of that.  Adding bright brights and reflective shiney things.  Also fixing little mistakes I made on the original shading.

pic 3) Tinting original shading…

pic4) Adding a multiply layer and a colour dodge layer to add more shadows and more brights (like on the gold).

pic 5) Final Adjustments… BOOP.  DONE.