Comics tend to exaggerate the head size, and within the head they tend to exaggerate feature size (nose, eyes, etc).
My current drawings tend to stick to the standard human proportions except that eyes are slightly larger, but I'm not drawing a comic, I'm illustrating a novel. When I do decide to do a comic adaptation I will very likely make the characters more cartoon like, both for ease of drawing and to make them more visually appealing.
In comics you can even vary the ratios greatly within the same story. My favourite comic character ever, Asterix, actually has a torso the same size as his head:

But his sidekick Obelix has a head-to-body-height ratio much closer to real people (though his torso shape is comically fat and his legs are tiny). Note that his nose is the same size as Asterix's.
