For reproduction companies, the usual approach is to license usage rights rather than sell the image outright. A practical structure is to license the photo for a defined period, such as 1–2 years, and specify whether the usage is limited by quantity or effectively unlimited. Time-limited licensing can work well because if the company wants to continue using the image, you can renegotiate at renewal.

Be cautious about pricing based purely on sales volume or revenue share, because you may have little visibility into the company’s marketing or actual sales. A fixed license fee is often simpler and easier to control.

For stock-style uses, assume the image may circulate indefinitely once digital copies exist, so price accordingly if you grant broad or perpetual rights.

If you are also selling limited-edition physical prints, an authenticity certificate system can help document edition limits, but that is separate from licensing reproductions.

In short: define the rights clearly, prefer a fixed-term license, and charge more when granting broader or longer-lasting reproduction rights.