Credit and “exposure” only have real value if they reach your actual target buyers. For office wall decor, that often won’t be the case, so it’s reasonable to ask for money rather than accept promotion in kind.

There isn’t a single correct per-photo price. Licensing depends on factors like usage, print size, exclusivity, duration, number of images, and your local market. A practical way to estimate is to compare similar print-use licenses on stock or licensing platforms, then adjust for your market and the scope of the use.

If you want a more formal benchmark, tools such as fotoQuote are commonly used as a starting point for image licensing.

So the best approach is:

• treat this as a license, not a sale of the copyright
• define the use clearly: one-time, interior office display, print size, number of images, location, duration
• charge cash unless the promotional value is genuinely useful to you
• use stock/license pricing or an industry pricing guide as your ballpark reference

In the shared example, the photographer used microstock print-license pricing as a rough benchmark and adjusted from there.