How do you make a photo interesting? One key technique, is to make the photo reveal as little as possible. Make the viewer ask the question "what am I looking at?"
There are things in the picture above that do not quite fit the image of a motorcycle, but it sure looks like a machine.
Looks like a dangerous machine. If you can raise emotion, you will also raise interest. Fear of hard, pointy objects is natural. I would not like to get too close to that thing when it is moving.
More pointy things. Whatever this thing is, it doesn't follow safety regulations.
It's obviously a machine, but it's an alien machine. It could be old, of course.
Dangerous! A machine with teeth? By revealing only pieces, you can bring the emotion up a notch with each picture.
At this point, if you could see the whole thing, it would become a relief.
By this time, I think you may have figured it out. I won't kill the suspense by revealing everything in this post, but you can go here, to get the full picture.