Directly in front of eye there is an off-white area. Some tan is visible, along with specs of white. Tan could be staining. White could be area where yellow appears in adult Tundra swans. I took hundreds of photos, and in this photo:
1. The top of the upper mandible looks flattest.
2. The top of the forehead looks flattest.

I'm open to suggestions and comments, via the BirdYak group hosted on Yahoo.

Kevin Lucas
Yakima, WA

19 November, 2012