So, I sense that you posted this, initially feeling some remorse for your choice. 
You pose the question, (implied) Am I being prude? "Should I send a nude pic to a stranger?"
 
On paper, business theory would indicate that it depends on your value of $$ and what you are comfortable trading for it. If you are really comfortable with your body - why not send it? The best thing that could happen is it could inspire someone to come see you. The worst thing - nothing happens. If $$ is your objective, doing so increases your results and total revenue - Sex sells. So, if someone asked
 respectfully, and you only had slight reservations about sharing photos, then yes, I would say you should let go of your anxiety and do it (you want to anyway or you wouldn't feel emotionally torn)
 
Now in the case of 
this guy specifically - Hell no. You did the RIGHT thing. Too many little things were adding up there to a disrespectful, creepy vibe. In your shoes I would have been looking for a way to cancel and this guy terminating his interest would have made me dance a jig! 
To expand on dennisrn's quote, the pursuit of 
bad $$ (in the hands of an
 asshole) is usually much more misery and trouble than it's worth. Better to skip it so you can move on to the next GOOD experience faster!
 
Best of luck and Stay safe!