Are these models?
I shot the OCC choppers a few years back, I'll see if I can dig them out.
I used smoke to add more interest to the shot, the plain background isn't helping you IMO
Oh, stick them on a plate of glass, with black material underneath for a great reflection.
edit:
here you go
Looks good, but IMO the large border takes you eye away from the bikes.
I have to agree I think that the border takes more from the photo's than it adds so I would be tempted to loose the borders :shrug: I also think that this could stand with a little more lighting as they feel a little under exposed
Matt
MWHCVT