The creative control is entirely up to you, Reivax. You can use one flash as I did below to get an even exposure from top to bottom the way you do in fashion photography. It's more distant and positioned lower than simply pointed at the forehead as some of your examples might be, and the harder shadows make for an editorial, contrasty look as you might find on a magazine cover.
This may not suit you.
You'd otherwise fill the torso and legs separately with say a lowered umbrella, maybe a stop down from the face, for which you might use a gridded softbox or even a beauty dish. You'd be achieving a softer look.
Part of the reason those other photographers have tolerated underexposed legs is that another light can influence the background illumination, too, whereas a single light up high pointing down 45 degrees is hitting the floor. But hey, we're photographers, we're big boys, we know we have to get both the background and subject lit the way we like, that's the art of the setup.
Last edited by clackers; 12-03-2017 at 04:27 PM.