Thanks,Toomas.The yellow cast is the natural evening light,plus the tree sparrow isn't really white on the cheaks.It's more ebony.You are maybe fooled by the backround which is green.I could change colours in PS,but I want the real colours as it was.
And an excellent first post it is - keep them coming, Thomas. Very nice pose with good detail in great light with a clean background. Please include some of the technical details with your future posts. :)
TH, I've photographed quite a lot of tree sparrows, I know what they look like, trust me ;) I cannot find your e-mail address, but if you care, I can send you a version of the above image with some white balancing done so that you can see what I mean.