Beautiful! Your goldfinches there have more colors than ours do in the us! Such a treat to have them, eh?
I've always read the ones here like thistle, and I used to put it out. They went for the sunflower seeds (and the mud) instead!
But guess what finally got them into the yard a few seasons ago. I have a plastic water-jug tied to a branch, over a makeshift birdbath. You prick holes in the bottom of the jug, and a tiny, light spray of water comes down from the jug to the bath!! They loved that spray, the seasons they came. (They don't come every season here.)