How to find a good photographer and what would be the best poses and images for an advertisement? Should I show my face ?

"Professional photo shoots" is the topic of an FAQ.  Let's see ...

Look at other Provider ads and when you see a style you like, contact the Provider and ask who did her photos (if the photog's watermark isn't visible on the pics). That will also guarantee an "escort friendly" photog who will let you use the pics as you choose and not try to prevent you from using the pics in ads.

You should know what to expect from a PRO and that should include a contract that explains what you will get for the fee. E.g., he or she might take 50-60 pictures during a 1 hour shoot but you only get to keep, maybe, 10 (or 6 or 12) but can pay extra for others that you like and might want to use. If there is photoshopping or other post-pic processing to be done, it should be spelled out and, IMO, there should be a time frame for delivery of processed pics. You don't want to shoot in Oct 2016 and get the pics a year later: they are "stale'" by then. If you are good at your own PShop, you can sometimes ask for the raw images.  

WATERMARKING - important if you want to prevent theft of your pics. The photog can do it or you can do it. An extra fee or in the contract?

Consider bringing a friend to help with hair, makeup and outfit changes so you don't waste studio time on that stuff. Personally, I hate to see wrinkled panties and twisted bra straps in glamour and boudoir photos. Depending on the time and place of your shoot, I will volunteer as a panty-smoother.  

Poses: you'll get lots of feedback. Include some full body shots so we get an idea of your overall appearance. Until you get comfortable, I recommend not showing a recognizable face: either blurring or a mask or cropping. But do include pics that provide a general appearance: face shape (round, oval); hairline; thin/thick lips; narrow/broad nose; ...  

There are many other little things to keep in mind when preparing for a pro shoot, none of it scary, just things to make it do smoothly.  

Whatever you do: NO UPSIDE DOWNS!

Wait a few seconds for it to flip

I've seen this question asked on a number of local boards. However, before you do, try a search of the board using "photographer" as the subject. There are photographers who travel to different cities and do shoots, so don't limit yourself to just local photographers.  
 

With one click, you can get to see 20-30 photos, then you can work back any number of days.

When you see a provider with photos that you find consistently to your liking, you can contact her and ask about her photog

Personally, my favorite photographers are those who will give me a disk of all photos taken during the appointment. I don't really do photoshop on mine so I love having all of them available. Also, finding a photographer who has a professional hair and makeup person might be the best advice I have gotten!  
The last thing I will say on photos is don't underestimate the value of a well taken selfie. They keep things current, show how you look day to day, and they're free!

is not something I'd necessarily recommend.  A potential employer could figure it out, and either deny you a job or fire you because of it.  Nosy family members or friends could figure it out.  Until society becomes more accepting and the laws change, I recommend keeping you face hidden from the general public.

😊 thanks