I did the same things with my hands just letting them dangle awkwardly last year when asking if I could take pics with cosplayers. Most of them put their arm around me automatically. I remember there were two guys, one as Batman and one as Joker, who told me how to pose with them. I thought that was pretty cool even if the scene probably didn't look the way they wanted it since I couldn't wipe off the goofy grin off of my face, lol. I couldn't help it. It was my first comic book convention and I felt like I was a kid again and visiting Disneyland for the first time and seeing all of my favorite characters come to life.
Otakon Las Vegas 2016
LVL Up Expo 2016
Wizard World Las Vegas 2016
Amazing Las Vegas Comic Con 2016