Unfortunately the woman took NO photos of our gender determination of the twins at 16 weeks. We go again at 20 weeks and if I have a different person I plan on asking for a gender determination while giving no clue that one was already made. However, Baby A (the one 100% said girl) definitely looked like a girl to me from the front view and we caught good glimpses from the back.
Baby B had her feet over her head the whole time we tried to get gender so it wasn't a potty shot. I'm disappointed that they both looked like girls but I've named them and am starting to get excited about sisters for my DD. However, would you trust a gender determination looking down from the top like that? There was no potty shot to be seen, so I'm thinking I need to wait to know 100% for sure until 20 weeks.
I wish I had pictures to show to get advice... I will specifically ask for them next time.