I am seeing this more and more.  A picture is required in the first contact.  Even if I just want to know if she is available on a particular day?  Are 20 year olds ok with sending pictures.  

Here is may all-time favorite.  Her ad has no phone, unidentifiable photos, and no useful information.  And the ubiquitous dead Facebook link.  So, send her a picture...

i've been provider for fairly long time and have never thought about requesting a photo.
i for sure have regimented screening process, but that strikes me as potentially breaching the discretion & confidentiality needed for mutual trust when it comes to sexwork biz.
imho