I did mention using window light but we don't know which way the window faces and whether the light will even be usable. This time of year, window light can be very blue up here in Canada, just depends upon a lot of factors. If you count on it, guaranteed it will be a snowy day and you've got nothing to use. Sort of a last minute decision.
You're right though. Window light will sure add a three dimensional feel if it can be used. I think I'm more anti-Xmas tree because of what it looks like. If it were a real tree cut from the neighbors lawn, I'd go for it.
Anything added here is always a welcome addition.