A

Illumination is from the right, but some of kind of black dust is blowing strongly from NE to SW. 

Now I'll give you some enlargements of objects mostly from the upper right of this picture.  There are lots of anomalies here; I only picked the 3 most obvious ones. 

I saw an obvious machine like a tinker-toy wheel, with six spokes and six segments around the circumference.  Each of these sections has a uniform round cross-section -- like a pipe -- and a specular reflection like metal.  The machine also has a shadowy structure - about 1/3 of the wheel's diameter across - connected to the hub on the left side.  The wheel is standing on edge on one of its 6 flat sides but appears to be slightly tipped over (leaning away from the camera).   It is the most obvious machine-like structure I've ever seen on Mars.

 

See if you can see it now.  This is a 7-frame animation with each frame having successively higher contrast.

This picture came from the area near the wheel where you couldn't see anything special before.  Please have a 2nd look.  I outlined a black tarry substance in red and the mouth of a cave in blue.