100% agreed that if they transfer money to your account, they'd know that they did through their bank. It's sort of like if you write a check for a bill, you'd know they cashed it because you'll see it on your account. You wouldn't need their account or pin number to do so.

This sounds 100% like a scam. Models are particular targets because they're looking for odd jobs to break into the industry and build a portfolio. So my advice is to simply forget about this job and walk away. If you already shot photographs, keep in mind it's very easy to set up a fake studio at some abandoned building. Verify the agency is real and the person actually works there. Ask for cash but if they insist on you giving them your account number and pin, do not do it.

Edit: Not even the bank would even know your pin number. They'd have no way to get your pin number. That's how secured it is. Your pin number is encrypted and salted at your bank and on your card if you have the little chip in it. So it's very secure, very personal. You should never give it out.