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Looks like framing using Chuck's suggestions. Yes? Works very well.
These shots are done very well technically, with good exposure and preservation of the whites, good detail and nice sharpness around the eye. Especially the first two. Colors look good as well. I'd cross-post some to the Nature/Wildlife Forum, where quality is often disturbingly high!
First is a bit centered, but I think it works very well. You have the bird forming a nice diagonal across the frame, pointing to the small cluster of berries upper left. If that corner were busier, I dont think the image would work as well.
Second is nice but a bit more static presentation. More documentary and perhaps a bit less artistic. Seems a bit more soft around the eye. Maybe some selective sharpening.
Third doesnt work quite as well, compared to the second or the first. The head is pointed off in its own direction, without relating to the frame or suggesting another subject. The OOF branches detract a bit.
Fourth is a great action capture. I agree with Chuck's suggestions about centering, rotating the image,
Last image is nice, despite the shadow across the body and head. It feels dynamic. The background is beautiful and clean. Maybe a bit more highlight recovery. To perfect, a capture with the bird's head rotated more to the plane of the camera. But this a nit in a fine composition.