You'll have to change your name to Robin!
This is a very nice shot, and you have to look very closely to see anything that can be improved.
Close examination shows that the eye and beak are not sharp enough, - while the side feathers are perfect. This leads me to believe the point of focus was just behind the eye; its also possible that a slightly smaller aperture, f/8, increasing ISO would have performed better. But at such a low speed, the results are extremely good.
Heres a useful link where you can input your own camera and lens information to determine just how much depth of field you had to work with in this shot:
One toe is missing as you know, and this can be faked in quite easily with a copying an existing toe and moving it over and aligning it.
The composition is a little too central, and when I used a square crop, it worked well, placing the Robin nicely on thirds.
I sharpened the eye and beak separately from the rest of the bird, cropped, and repaired the toe in the mod.
Good work, and hope this helps,