Wie kreiere ich gute Action Film Poster in Photoshop?

Since I wanted to translate exciting and creative ideas into Photoshop, I tried many times, but either the picture was overexposed, too dark or the background didn’t fit the rest of the picture.

There’s no need to practice. These film posters are designed by professionals and you have to recognize yourself in image processing. In addition, you should always make sure that the lighting conditions of photos match each other. A photo where light comes from the left does not fit the background where the light comes from the other direction.
So only tip would be: practice, practice. Do PS Tutorials to learn new things.