I am not capable of commenting on the lighting, I will leave for the experts (although it looks good to me). But two things I would say on the shot. The left elbow has been cut in the crop, which is probably the first thing I noticed. Also the left eye seems to have merged into the eyelashes, this probably wouldn’t be as noticable in a colour version, but is the B&W.
These are just picky things in an otherwise lovely shot, great looking model.
The darkness of left eye area and as PD Barbs said the merging of the eye and eye lashes – could be the processing of the image? also the motif on the clothing unless it was required for advertising? I too agree the slight cropping of elbow looks accidental and is distracting – a more deliberate crop further removing th empty space to the left might help frame the face better