I think 56mm lens vs zoom is one of the factors. 56 is made for this kind of work (headshots). It is great specialized lens. If you look at her pictures taken with 35mm 0r 60mm, they just don't have that crisp look. Neither pictures with 90mm when whole body is in the frame. That lens is amazing when used properly.
It looks to me that you did a little bit heavier jpg processing (be it in camera or in post production) vs careful nondestructive RAW conversion.
Overall your picture is not bad.
Also, lighting. It needs to be more contrasty, coming from steep angle to accentuate texture (in this case pores).
I don't see a lot of D&B, some contrast is added in post, but it's mainly skillful lighting.
There is some toning down and a bit of desaturation, to make colors subtle.
I've never found frequency separation to make a big difference in overall results, like I've never seen this difference working 16Bit vs 8Bit files.But, it won't hurt either. after all, it's just an action to prepare an image for FS.
Also, her light is controlled vs yours not being. You tried, but it's not. You added a reflector, or an additional flash in front low. Front light won't accentuate pores and lower angle will give horror like appearance.
But, these are small details, your picture is good on it's own.