A ground plane would be good, then we have something to judge it against.
Personally I think the rear leg is to short (not perspective) and I think you could use a harder brush for your edges, your 'metal' looks very organic.
Just some initial thoughts
Thanks, Venger, for the very helpful crits. Back to work I guess....
There are five alterations from the L pic to the R pic. And only one makes a real difference.