Although it looks good right now, it could still use a bit of work.First of all, its given a really smooth texture and it doesn't look like the texture that wood would normally have.
When you look at wood, you see a bit of lines going across the wood. now, even if this was polished wood, it would still have the grains. If your trying to go for a polished texture, add a bit of shine to the edges. So get the grainy texture, and it will look SO much more realistic.
On the metal, don't be afraid to highlight the metal all the way to white. Metal is ALL about shine. so more than anything, the metal needs HIGHLIGHTS. and lots of em'
. The nail looks like its curved. :S thats kinda messed. Try to make it a bit straighter, or bend it.
The BG is ok but the colour doesn't really match the whole icon itself. And also, try to add in more of the lines and put a colour at about 50% opacity and overlap the lines a bit. This will give a better concept of what your trying to do.
2.8/5 Well Done, Keep it Up! Your getting better.
~Dentothor