in most of my pieces with especially dramatic lighting/colors like the one you mentioned, i start out with a greyscale and render it in greyscale untill i feel good about the values and details. when im done, i make a copy layer of the whole canvas and apply a gradient map (filter which replaces certain values with certain colors you assign.) not always but pretty often, i correct some places through layer effects (for example, if I think its necessary for an object to be a certain color to be recognizable in the picture, ill set the layer mode on something like "color" and adjust that object through it. after that its usually just a bunch rendering/filter/special effect loops again untill i think its done ww...

im really bad at explanations, so i hope this is understandable enough. my work process is not at all streamlined and its hard to say i follow any formula down to a t, but id say this is how it is most of the time. thank you for your interest!!....