Unfortunately, the pictures I take are really, really dark and stained green.
I tried several camera apps, none makes any difference.
When look at the screen to see what the picture will look like, it looks perfectly normal. So it is not the lense I guess. I would add a screenshot, but as a new user, I cannot.
Once the photo is taken, the result just looks horrible.
What are my options?
Just a shot in the dark.
Do you save the pictures in internal memory or on a sd card? Change the memory location option in your camera app and try again.