I would love to see this species some day! Good colours, and I like the low light. I feel the comp would be stronger without the green band at right edge. Critical focus looks like it may have been on the tree bark?
Agree with Daniel, that the focus seems to be on the bark. Hopefully, it is just user error and not a front focussing issue :-)
Loved the color and the BG a lot. Shooting warblers at that focal length is certainly tough. Judging by the DOF, does not look like it is a big crop....so well done on getting close.
Very good pose and eye contact. BG good except for light band upper right as per DanielThe perch is very interresting but wonder about removing the segment in the back that extends up and is out of focus it has a tendency to draw away form the bird. still a great image. Would like to see one