Everything that I would recommend to prevent such a situation should have been done before the actual shooting. The first things to clarify before setting a date is a) What does the client want exactly? (Does she want the photos edited or does she want to edit them himself?) and b) What is the client willing to pay for the service she wants?

Do you know what photographers she worked with before? If yes, call them and ask about what they’ve billed her. And then go from there.
Do you have a website where clients will find your pricing structure?

In the end, you have two possibilities:
- Tell her, that this is your usual pricing for this kind of project and that you expect her to pay the bill in full (she might not want to work with you again, obviously, and also get legal advice).
- Call the client and thell her that you are sorry for the inconvenience. This is your standard pricing, but you are willing to give her a discount. How much of a discount depends on your negotiating skills. ;) Maybe only send her the unedited pictures and remove the editing costs from your bill?

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I think your prices aren’t unreasonable, but I expect people who have nothing to do with photography be shocked about how expensive it can be. And I guess there are a lot of photographers who are cheaper.

I will (usually) edit the pictures myself, but in the end I will do what my clients order. And clarify their order before the shooting, not afterwards. ;)

I assume it depends on the laws in your country. And then it also depends on the contract you’ve made with the band. You have made a contact, haven’t you? The permission you gave them was written down somewhere? How did you send them the files?

You might contact the newspaper and tell them they didn’t have any rights to use the photos without crediting you and demand a reimbursement or something (depending on the laws in your country).

You might also contact the band and ask them how the communication with the newspaper went and why they didn’t credit you. The newspaper is probably going to put the blame on the band anyway, so you might as well talk with them first.