Wow, stunning wing up position, Ignacio. Beautiful complementary colors of bird and background. Nice and sharp and good call on the vertical. Wish to see a bit more details in the blacks but maybe they weren't even visible to the naked eye? Otherwise great detail and IQ. Are there some out of focus grasses in front? I would try to darken that one area on lowest part of belly where it looks as if the grass has overlapped, if you're ok with that.
Super wing position, great details and such a lovely species. I have not seen a golden in summer plumage, but did see the Grey Plovers in it in Portugal.
Whites do look a little hot on my desktop,
Wonderful pose, great detail. I could see just a little more room around him, and second Melissa's comment about the grass area on the belly. Still, a marvelous shot of a bird that I would love to see in this plumage.
Thank you all for your comments and suggestions. This is practically full frame - during this kind of display, meant to lure predators away from the nest, the birds sometimes get very close... Needed lots of care to get the whole wing!