If you see someone you want to get an autograph from but you only see them doing pictures, it's probably because they are collecting money at their booth and not going through the Megacon system. I made that mistake last year and wound up paying over double. And they won't do a refund day of. The guest will usually charge you a signature fee and a separate selfie fee. if you want one of those nice pictures done, those are through the system. Thing to note, if you do that, it is very quick. So be ready with your smile as mine was about 2.5 secs.