Here is a white throated sparrow from Garrett Mountain, a migrating warbler/sparrow hotspot. 1D mark IV, 800 f5.6 with 1.4x III, iso 640, f10, 1/250 shot from vehicle blind with 580ex flash and better beamer.
Nice pose on this little one. The BG is lovely and compliments your sparrow well. I see Alan's point of upping the flash just a tad but there is something natural about seeing just a tad of shadowing on the head. If it were mine, I would remove the second catchlight.
One of my favorite sparrow species. I like the pose, and the BG. Good diagonal from the perch. I'm used to seeing the throat and crown lines whiter than this individual has. I'd prefer a looser crop, and PP-wise just be careful with the BG bleeding onto the perch from below.