Th exposure on the bird is too dark for me to appreciate the bird. Because of the lack of lighting on the bird, I find my eye is andering around the photo for something to settle on. JMO.
I don't find this to be a goood subject for a silhouette. I'm guessing you were attracted by the shapes of the nest and the twigs but there seems to be too much going on with the wires and the spot of blue leads my eye to nowhere. I'd like to see the bird clearly. Instead I'm looking at a boring wire structure and an equally boring patch of sky. I reccommend next time, in shooting a subject that forces you to point your camera to the sky, you bracket your exposure because this is a case where your light meter is being fooled by the amount of light coming from the sky (this may be by setting your EV rating to + something or you may have more sophisticated equipment that allows you to do this manually). Of course, you may already know this information and were simply going for the silhouette effect.
The 2 basic things that instantly marr this photo is the light and how it's composed. It's so dark that all details of the bird are lost and yet it can't pass off as an interesting and clean silhouette. Composition is usually (altho' not in all cases) more interesting if you follow the Rule of Thirds. Here you could probably position the bird more to the left on an imaginary vertical third of the frame because it's facing right. Let me know if you'd like some help. I'm no expert but a couple of basic things can certainly be done here to show you instantly a difference.
Backlit photos are hard to do. You have a great subject here, and an interesting angle, but due to the white clouds in the background, the bird (which should be your main subject) is severely underexposed and almost just a silhouette. Not sure what camera you are using, if you have exposure compensation, deliberately overexpose, or use shutter-priority to achieve the same. You'd have a much stronger photo then.
Sorry would have loved this without the cage. It's also a little distracting because it's a silhouette, bt then can see red colour and some detail, but not quite enough. 5/10