Dudley Carlson thinks this is a male. She says: "These are absolutely lovely! I'll come back begging for chickadee and goldfinch photos some time soon. For now - I think all of your goldfinches are Lesser. The chief mark of distinction is the greenish head and back, and on the males the cap comes back and down farther over the head than in the American. My only quibble would be on gender on a few; I think #4, 5,and 6 are probably male (amount of dark on head); 19 is probably male; 34 male, 35 female. 40 Could be either; the shadow on the head camouflages the cap, so I can't tell.
"I especially love the close detail of the oak flowers; I've never seen them that closely, and with a chickadee or goldfinch involved, they're perfect! Thanks for sharing."