The advice is the same. Don’t pay them. If you pay them once they will just continue demanding more and more money. They almost never carry through on their threat. It’s too much work for no payoff. If your face or something identifiable is in the pic and they actually do send it just tell people that you made an embarrassing mistake and aren’t going to do it again. If you aren’t identifiable in the pic. Lie. It’s that simple. Say it’s not you and then protect yourself going forward by never sending nudes to anyone ever again. I’m guessing that you’re pretty scared and embarrassed right now and it is an embarrassing situation to be in, but people have done things that are much much worse and you will get through this :>)

Dude, also learn the lesson while you move on though, right? Don’t send dick pics or nudes.
The internet is forever.