When looking at this photo the first thing the viewer gets attracted by is the great pose of the dove. The way it hold its body and folds its feathers - most possibly to clean them - is very photogenic. You definitely observed the bird well, looking for the right angle and waiting for the best moment when the bird watches you for an instant. That is particularly important, as I increases the contact with the viewer, which has added to the impact of the overall image. Without the branch in the back the composition would have been even better. But technically, this photo could use some considerable improvement. First, the focus should have been put on the eyes in staid of the on plumage. When any model, animal or person, looks towards the camera to make contact with the viewer, the focus should be on the eyes almost anytime. It now gives the impression that the photo is out of focus, even if the focus is in the frame. Not focusing on the eyes could be a deliberate creative decision, but here the eye contact is what makes this image striking. Secondly, the colors look oversaturated. My guess is that the original image was too dark and when boosting the lightness/contrast the colors became oversaturated and a lot of detail was lost, especially in the midtones. Try to expose the original image better - in bad light conditions one solution is to work with a monopod or a tripod and a somewhat longer exposure, yet not too long so the movements of the bird don't get blurred. Nevertheless, this images does have a good impact and proves you have the vision to photograph birds. Good luck with your future work!
The way that the dove has its feathers spread into such a shape is really nice and makes for an interesting pose for the shot. Also the brown colour of the main plumage makes for a nice contrast to the green of the background.