Every professional photographer is an artist. They spend time learning their craft, developing it, specializing it, and trying to perfect it.
They are excited to deliver the images they have spent time perfecting to their clients because they know a lot of time has gone into the final completed image.
Most photographers even have a consistent style that they are known for. Some may be known for an edgy, decontrasted style, some are known for vibrant, color enhanced images or a muted, soft, light filtered style.
Regardless of the style, nothing can irritate a photographer more than a client taking the image that they have created and then attempting to "reedit" with of the many filters now available on smart devices.
You see, a professional photographer takes their craft quite seriously. They advertise and are hired for their certain style, yet when someone changes the image that style is no longer theirs. In fact, often, it poorly reflects what the original image looked like.
Imagine you spent a significant amount of time creating something and then someone changes it yet your name was still associated with it. What if it was an advertising presentation you were giving but at the last moment someone made some adjustments right before you were to give it? Or how about you designed a building and the builder decided they didn't like a certain element and adapts it during the building process?
Do you see what I am getting at?
If you wouldn't appreciate someone changing something you designed, created, or made, I can guarantee that a photographer feels the same way when you slap a filter on their images because you think it looks cool.
And, in fact, you are violating copyright. SO STOP.
Stop changing an image. Just because you have paid to use an image does not mean you have the authority to change an image. Did you hear what I said?
USE AND CHANGE ARE TWO COMPLETELY DIFFERENT WORDS.
So just stop. It isn't cool. It doesn't look better. And you may just land yourself in some serious trouble if the photographer elects to report the copyright violation. And some will. Especially if they get tired of it happening.
Be respectful of their craft. It's really just that simple.