Looks good! I see youre trying to use shadows and one thing I noticed was that the outline of certain objects had that black outline around it. Try to create a piece using different shades of color to show contour as opposed to that black line.
I also think it would have been cool to see parts of the tuning stubs in the face, and have a couple of wires still attached.
Overall, its a good piece but the black outline caught my eye