Half up front. Half on delivery. Space them out so you develop a pattern. Never full faces. Head cutoffs are unattractive. Wear one of these.
Whoever she is, attractive body by the way.
Paypal - when you get the money, you send the pics. Pretty easy.
Use some type of app, he sends money b4 u send nudes. Or snapchat u can send a teaser to show u r real then let him know, pay b4 display.
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Make them pay first
The solution is pretty simple. Have him pay first.
That works unless he says he's concerned that I'll never send the pictures haha
That's his problem, not yours.
'take it or leave it'
Get the money upfront.
Send them to a neutral third party that will wait until he sends the money before sending him the pictures.
you could just get a real job
this sums it up well
Amazing
You could try not being a whore and contribute to society, just a thought.
Sexual Relationships 
Sexual Health 
Superb Opinion