Good job! I find it amazing how difficult a 'simple' still life can be, and just how much there is to be learned from them. From the signature I am guessing you are calling this one done? If not I think a few others before me might have mentioned a few things that could potentially help it, if you would like any additional thoughts please do not be shy, feel free to ask.
I am sure everyone here just wants to be able to help in any way they can, I myself notice a great number of things that might be useful. That said, I will refrain as you should feel quite proud, this is a challenging subject matter, with a lot of things going on and to consider in the painting and you have managed it exceptionally well. Once again, good job, I still find myself struggling with simple subject matter like this all the time (in particular the metal, getting it to look just the way I want). Keep up the great work, can't wait to see more!