This is a pinson (chaffinch). I can't tell if it's a male or female; the male's head is usually more blue in color.
The birds enjoy the seed balls. Our most common visitors are le mésange (the great tit, blue tit, and crested tit), le pinson des arbres (the chaffinch), and le rouge-gorge (the European robin). Recently we've seen a mating pair of merle (common blackbird) eating the seeds. I see chardonnerets (European goldfinches) out there from time to time as well. The tits cling to the seed balls and pick at them, throwing a lot of seed down onto the deck. The other species walk around on the deck eating what falls.
The same pinson takes a look at me while I take its picture.
In addition to the seed balls, I have two hanging feeders that I fill with a loose seed mix. One of the feeders hangs from one of the maple trees out front, the other is suspended above the real fake well out back. At the feeders, as with the seed balls, the tits land on the perches and throw seeds down to the ground where the chaffinches, robins, and blackbirds gobble them up.