Well I couldn't really see anything I'd call *spots* in that picture. They will have some darker places here and there in their down.
If there are spots that are dark that I couldn't see in the picture.. I mean it's possible it might not be completely white but I bet it will still be a light...
Yeller down is usually a light color. No eye stripe so not pastel besides the fact both parents would have to have the blue gene to be pastel.
I am a guessing it will be white.