What do you respond to nudes?

I’ve received x number of nudes in my time, but sometimes I run into a wall and have 0 good answers back. Doesn’t matter if they are spontaneous or more expected images after a longer intimate conversation.

Got into a discussion with a friend about this, and we are equally divided. I’m 20+ fyi.

Give me any tips you have, what are good answers? It would be nice to get answers from both [F] and [M]