This shows the violet-green colors very nicely. I see a faint hair-line going from the feet to the left edge that you may want to remove. I like the head over the shoulder pose, showing the swallow is interested in something.
What a lovely looking bird and I Like that look back pose. Agree on removing that line under the bird. If you have the space. I think I would crop from the left and add to the right and top. I would also sharpen the head just a little more.