Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
Graphite Pencil Sketch of model Marilyn Monroe. The sketch captures a serene expression of a model gazing off to the side, with delicate strands of hair cascading over her shoulders.