David, the details in the Siskin look great, with it and it’s rather nasty perch standing out well against the white background. The tones in it’s head seem a bit washed out, so a light touch of burning (or reduced dodging) would look good. We’re having a cold spell, so I keep hoping to see some Siskins at our bird feeder with the Goldfinches, but nothing yet.
The little bird is quite the opposite to the perch, which gives a clear indication of how small the bird is. The over-the-shoulder pose is one of my favourites.
Would you consider removing the two spikes from under the bird?