Honestly, I don't know. I mainly use colored pencil to do foundation sketches, then use graphite or ink over that. For the more detailed drawings, I choose colors that correspond with the undertone of the model's skin, just way more saturated.
That was helpful. Thank you. Laying down the colors first makes more sense, since then it won't get mucky with graphite or ink. That is probably challenging to do without an underdrawing. I'll have to try it out.