Here's a nude for you ... ...
If you're actually real and creepy/unsavvy enough to ask for what you did (and not some troll looking for a reaction from strangers on the internet) Why don't you be a gentleman instead of some creeper who is encouraging some stupid little girl to send him nudes of herself?
She's dumb for sending nudes to ANYONE who she is not in a committed long term relationship with and you're inexperienced and come across as disrespectful for asking her for nude photos or offering to send some of yourself.
She's done the right thing by telling you "no" (should have done that with the other guy as well). Next time you want to pursue someone, ask them out instead of doing what you did this time.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion