On the left of this image, part of the rover’s power supply is visible. To the right of the power supply can be seen the pointy low-gain antenna and side of the paddle-shaped high-gain antenna for communications directly to Earth. The rim of Gale Crater is the lighter colored band across the horizon. The effects of the descent stage’s rocket engines blasting the ground can be seen on the right side of the image, next to the rover.
The image was taken on Aug. 7 PDT (Aug. 8 EDT).