You have captured the bird nicely in flight, it does though seem to be slightly out of focus. The problem I'm seeing here is a lot of grain or pixels in the sky there is also some grain on the birds breast.
The grain I'm seeing I'm not sure if it is from being cropped then enlarged or a lighting issue, although I'm thinking it has happened because you enlarged things.
Other than all the grain I am seeing the photo has a nice composition and it fits the challenge well.
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