Not bad, the proportions are off a bit I think. There's a little too much glow on it, and the glowing "engine core" isn't translucent.
Here's a screen cap from the bootleg..
As you can see the body of the cycle is not as elongated, and the front wheel is not quite that large. It could be the angle of your still shots of your render maybe?
Sorry for nitpicking, overall it's pretty damn good, and way *way* better than I could do.
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