it also depends on your luck! some agents may give u another girl who is available. sometimes will be better, then u can take her. if no good, u can insist to hv the one u want.
if u want to try girls who is popular, in TST or WanChai, be prepared that u may need to wait even u already made appointment.
for the face of girls, it also depends on your luck. mostly, it will be 60-80% similar to photos. but may be the girl hv some primples on her face, then she looks smooth skin on her face as photoshop can easily do it......
hope these info help!
