The Acorn is hnife sharp. Good control of DOF here. Having the background in the same color as your object doesn´t bring out your subject enough. A background in a contrasting color (Yellow) would have made this one a excellent picture.
Nice colors. Wish the whole acorn were in focus, but then you might lose your nice bokeh a little. I think this bigger (640) and a variation in crop and composition would have made a stronger image.