There's a stillness to this shot that comes from the bird itself, puffed up and settled on its perch, seemingly unbothered by the camera. The dark, shadowed foliage surrounding it does most of the work here, swallowing up any distraction and leaving just enough soft light to pick out the warm tones in its chest and the sharp black and white markings along the wing.
What draws me back to this one is the eye contact. The bird's turned its head just enough to look straight down the lens, and against all that murky green and brown it creates a quiet sort of tension. Nothing dramatic is happening, but the framing and the low light give it a moodier, more intimate feel than a typical garden bird photo.