After I took the photos and did some research, I realized that this is an immature male in its first breeding season. When in full breeding plumage, a mature male's head will be fully black, the rose color will deepen, and the brownish streaks will disappear, leaving the bird with its stunning black, white and rose-red coloring.
What a beautiful bird.
On this date in 2011, I posted a photo of a male and female (shown below) on one of our other feeders. You can see how the immature male in the photos above is like a blend of the female and the mature male shown below.
|Rose-breasted Grosbeak pair (2011)|