I like them as they are inluding the lighting, nicely frames the subject with the light falloff around the edges.
photo 2 for me is the best in terms of lighting and composition, 1 and 3 are ok in illumination but composition not as good.
Im not sure what features are in lightroom/photoshop as I use corel PSP X5 and theres a really nice feature in that to adjust the fill light and that may help a lot in reducing the darkness for your GF.
How about in grayscale? or perhaps number 4 in selective colour?
Thanks for sharing though they are good photos