Thai women are beautiful, with a huge variety of looks just like any other ethnicity. Even if a particular girl would have a hard time taking a "glamour" picture, they know how to look cute while they are bouncing on your knee trying to get your business.
You won't find many internet escort sites, because there is no need for them...you go to where the girls are.
Many of the go-go bars (in Pattaya especially) have web sites that picture "staff" that may or may not actually work there at the moment. So do some of the big massage parlours in Bangkok. Google for a while and you will get a range of the beautiful women available. Thais think light skin is most beautiful, so you will see an over-abundance of those on the massage parlour web sites.
Heck, I just went back and googled "Images" for "thai girls" and got tons of results to click on.
There is an abundance of information on the internet about wheres and how-tos.