It's not bad!  :o)  But since you ask for suggestions:

1) Jaime used far less focal-blur samples, for the sake of render speed, but
that adds to the fun. 2) You could make the inner spiral more thick and
round. It's too thin. Actually I know it's not a spiral, but okay! 3) The
textured lines on the bolt-sides could be improved by rotating them 90
degrees and make them dimmer, less regular. 4) The bolt texture has a nearly
invisible normal map, so it's too smooth... 5) The specular highlights are
very strong, suggesting the rest of the surface is almost mirror like, which
it is not, at least for these kind of bolts. Maybe raise reflection and
lower specular. If there's reflection at all? 6) It's green.

So, was there anything here you hadn't thought of?  ;o)
Good luck with the challanging project.

Regards,
Hugo

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