Why do my pictures look red?

A few questions..

Is the camera digital?
What software are you using on your computer to view the photos?
What kind of camera?
Do you see the red tint in the screen on your camera?

For the last three I assume your camera is digital.

Its most likely your cameras white balance setting.

Its prob on a setting that’s trying to adjust for a “cold” scene such as a cloudy day or flouresent lights.

Also check for the cameras saturation settings which can lead to the look you are describing as well.