Yes you are getting a better idea of the motion aspect of this assignment.
The problem with this image was that you didn’t use a tripod and the rocks are blurry.
To achieve the effect you want here you must use a tripod. Also, use your camera’s built in timer to avoid shaking the camera when you depress the shutter release button.
Try this again and resubmit it if you like!
Otherwise I’m glad you’re getting a better understanding of this assignment.