I have carefully examined Mars Rover pictures for years. Below are the results of that effort.
The pictures below were taken on Mars by NASA Rovers.
The picture was of a cliff wall that had dark spots looking like caves. This is an enormous blowup of one of those dark spots. It shows the inside of a Martian Cave. It required fill light and vibrancy (color intensification). Note: I checked many possible caves before I found this one. Most just showed boulders.
Yes, there is life on Mars!