In all honesty, I prefer to see a woman's face in her pics. I'm a firm believer in "truth in advertising". However, I completely understand the need for providers to have some discretion while protecting privacy. Although, there is a part of me wondering "what is she hiding, buck teeth and warts ?"
Seriously though, it really doesn't matter to me, and I don't make decisions based on whether or not her pics show her face. Now, if the gal does decide to hide her face, I prefer the more natural way with head turned or creative photographic angles. Cropped pics are fine but obvious as to the intent of the provider, and finally, the blur is an all to completely obvious sign that the provider doesn't want her face revealed. I will offer one piece of caution for those who blur. There is software out there that can remove the blur, swirl or whatever method that is being used to obscure the face. Remember this. That which can be done by software can be undone by software.