|Greetings from the Critique Club
You have a nice image that does fit the Shallow DOF Challenge quite well. To have a shallow depth of field, it's important to also have a portion of the image that is tack-sharp. While this bird comes close, the feathers could stand to be lots sharper.
Now, the bird seems to be sitting quietly, so, given that circumstance, you might consider varying your composition a bit. The rather static arrangement you have now with the bird in the center really lacks interest for the viewer. If you had him head-on, for example, and perhaps on a diagonal, the composition would be more exciting.
Finally, the blurred background - and foreground - do meet Challenge requirements, but are just a little boring. A more interesting blurred background would make this composition really pop.
I understand that you can't do that with 'this' bird, but go bother some more pigeons and see what you can come up with. I'll bet you have a good time!
I wish you the best of luck in DPChallenge and look forward to seeing more of your work.