Hi escort38!
Personally, I choose not to show my face (or I photoshop it, e.g. blacken out my face!) when putting photos up on sites.
The first time round, I was such a naive and silly woman at 18, and put actual photos of me on there. Then, I was so taken in by all the "replies" I was getting, I had all the usual timewasters we encounter on a regular basis asking for dirty pics. I would stupidly send them and then hear nothing obviously (free wank material).
Although I didnt show my face second time round when I did it a few years later, my ex was snooping about the site, and recognised the pics, and grassed me up to my family. The consequences were devastating, and this is why now I choose not to put pics which can be recognised on.
When I go on SD sites, I put no pic on. However, I have had (been counting!) around 30 timewasters, who request a pic, and then bugger off. So now what I am thinking is to still keep the timewasters on my blacklist, but put a photoshopped pic of me on the site e.g. black bar over my eyes, blurred out face. Seeing as guys mainly wanted a full body pic, they cant complain if i put a full body one on with my face blurred out.
I have far too much to lose if I show my face on sites, so it's probably best if you have a professional job or something to be extra careful, as I have learnt!
All the best