Photos Two and Three...

Photo Two just doesn't do anything for me. My real problem with this is that the scooter is facing out of the scene. This leads the eye directly off the image, and IMO is something that should be avoided.

Photo Three is sweet, but IMO needed cropping to bring the main lines into dominence. Again I adjusted the curves and added an unsharp mask.

BTW... These were both RGB images, so I converted them to grayscale to get rid of the green cast.