Always explain them your price per item and total estimate for the project. And in case it’s a company make sure the person agreeing to the price is the one who can order a payment.

I thought of these:

• They hold their hands up like they would if their palms would touch but there’s a tiny gap about to close but still open, like their marriage about to happen.
• Guy a few steps up the stairs, lowering an apple/flower/engagement ring tied on a rope, girl stands on ground floor, smiling tries to catch it. Most of photo grey, only the rope and dangling object in bright colour.
• Beautiful landscape in the background, sunset or something, and their profiles as silhouettes from each side, eyes, nose, mouth all level to level, like those pictures you have to see either 2 people or 1 vase in the middle.
• Open really big umbrella (called golf umbrella), both hold the handle, either standing looking in each other’s eyes or walking towards camera, not touching each other. Spray some “rain” in between them and camera.
• Door. One comes in the other opens the door in a welcoming manner. Or just the opposite, jokingly tries to close the door on the other.
• He holds open the car door for her, she looks at him with love in her eyes. One foot out about to touch the ground, Princess Diana or Jacky Kennedy style.
• Beach, sea in the background, both run towards each other, hands stretched out for a hug.

Oh, yes, like those Victorian family portraits where everybody looks super serious, one sits on the chair, other stands stiff, holding on the backrest.