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#1 - This appears to be a composite of two separate shots. If shot together the subject in back would have shaded the accents seen in the hair of the subject in front. Judging from the catchlights and shadows on the lower full face subject the key light is about 45° to the left and 45° above her eye line. The subject on top, in similar key lighting is turned towards the light more. Fill source catch light indicates it is low and to the right. Accent lights from behind from both sides. Background added in Photoshop which is easy to do with masking plug-ins or by hand if you have some patience. Just fill a layer on top with solid color and use a mask to knock out the subject.
#2 - Getting light in the mouth like that requires near axis fill which appears from the catchlight to be coming from two softboxes placed just below the lens on either side. The shadow angle clues and a faint catchlight up at 11 o'clock indicate a key light about 45° to the left of the nose. As with the first shot the background appears to have been added with masking. Don't see any evidence the back rim lighting as in the first shot.
#3 - Key lighting on the face is similar to the others, above and to the left. Shadows are even and open, an indication of near axis fill but tone of the shadows on the arm being darker than those on the face would seem to indicate one or the other, or both, were adjusted in PP. No accent lighting appears to have been used and as with the others think the background was added in PP with masking.