Was the price unreasonable?
No. But the client never agreed to it either.
Do you not edit your pictures the way I do and do you only use presets?
No.
What would you recommend to do in that situation
Accept the price the client had in mind.
And in the future, make sure you are on the same page and in agreement on the price before you perform work for free.
Arguably yes. And certainly the client is partially at fault too for not getting on the same page about that beforehand.
But the client would argue that their perception of the business standard would be the lower pricing they got from these other photographers in that circle. And many jurisdictions have laws and judges that tend to side with consumer protection. In California, for example, many businesses are really careful to present the customer with a written quote of pricing, and to get a signature on that before doing anything. Caveat emptor is a thing too, but when it comes to a “they should have known better” situation, often it’s the business that’s primarily on the hook for having the responsibility of knowing better. Otherwise you open things up to predatory situations where a business charges what they want, hoping the client never asks first, and claims the client agreed to whatever their charge was going to be. It’s a lot easier for a court to just require that the business be upfront on pricing, and the business is screwed if they aren’t (an easy, objective, hard line decision); as opposed to having to research and evaluate if whatever surprise pricing was reasonable or not (a subjective decision with a lot of gray area).