We've all heard the saying "the customer is always right". If you're self employed they are literally paying your "wages", so we want them to be happy. But at what cost?
If we give in to every demand, our work will be a far cry away from our style or vision.
The most general demands are for more /all the photos taken in a shoot, and the editing processes.
A demand for all the photos is simple, don't do it. Yes the client has paid for you to take photos, but the photos are a commodity. You yourself are the product they've paid for. Namely your skills. Giving all of the photos to the client basically allows them to use any images in anyway, whether they're good photos or not. Imagine being credited for out of focus photos or dodgy poses etc. Photos you'd never put your professional name to, and everyone thinking it to be a true representation of your work... Building a reputation from that would be hard! If your client wants to see images before post processing, put them in an online gallery or go through the photos with them beside you. Just don't give the whole lot away just because a client has paid you!
On to the second part. Editing.
This is more focused on post processing. A client's biggest asks tends to be with colour. Usually a lack of. If you haven't given a selection of black and white photos from a shoot, chances are that will be a request. People think a black and white photo looks artsy. It also tends to make people look better in their opinion. (Black and white photos are good for us photographers if the light is hard to colour correct!)
Again with the lack of colour thing, it'll probably be selective colour. If you haven't seen selective colour before, it's basically a black and white photo with, say, the colour red saturated. Sometimes it looks cool, but it's a very dated technique. I personally don't put my name on these edits. But, if the client requests it, I'll either try dissuade them or I'll do it but without attribution.
Then comes filters. Instagram filters.
Instagram filters are cool. But that's it. We need to make the client aware that we spend hours editing our images into the final product they receive, and we don't want them messing with them. But, if we give the client a set of photos, expect them to Instagram filter it! Obviously a company is very unlikely to do this with product shots or whatever, but people will with portrait shots. It's an irritating part of life but something we have to expect and accept.
Pleasing the client isn't always about doing what they want or giving them want they think they want. Alot of it is attempting to educate them without patronizing. Or meeting in a happy medium.
We are the artist after all and we're only judged by the images people see. If we work well with our clients, we can build a strong relationship where everyone is happy.