Jack Kirby had the most unique color sense. Jack hand-colored the image below with Doc Martin dyes.
Below is the same image with computer coloring. The colorist has done an acceptable job, but it just doesn't seem as vibrant as Kirby's, certainly not as unique. One wonders what Kirby could have done with a computer.
Below is a picture of Kirby working with the Doc Martin dyes. Obviously, this picture was taken on "Casual Friday".