Comp card/headshot
Comp card/headshot
Honestly, I like the very first black and white image you opened the thread with is better than any of these.
Hopefully I'm not going to come off like and A$$hole here, but this is what I do for a living, so I'm not going to sugar coat.
The last one is the best as far as lighting and composition, but it looks like she is smiling with her face, but not her eyes. She looks like she is uncomfortable.
The make-up is horrible, it looks completely flat and does not complement her at all. Now I'm guessing the agency, or someone told you "no make-up" look for the headshot, this is not what they mean, she should look fresh and clean, with a glow. If you used a professional make-up artist for this fire him/her and get another.
Being the the headshot is generally the front of the comp card, it really needs to engage the viewer, use the light to shape her face and show off her assets while hiding any "imperfections"
Using the 645 RF for the comp is probably fine, best to use a camera you are completly comfortable with so you can concentrate on the girl. If you have one and feel good with it, I'd use a 35mm SLR, they are generally faster to use and you get a lot more shots 😉
I'll post a few headshots that agencies have loved.. The first is more of a commercial type model, shot in open shade with a white fill reflector.
The second girl is from click which is a bit of a commercial/fashion agency, this girls lips are obviously a major selling point, so that's what we focused on.
The third is not exactly a headshot, more of a "beauty" shot, because this girl is a fashion model. She's got a great profile, tiny nose, thus the angle.
The last two are obviously studio shots, but in both cases I only used one large light source, so you could do similar shots outside.