Cymbidium flowers are stuck!

[Miss Flower]

well i don't think I've changed anything...it's right next to the window where it's been all summer long. That window was partially open during the summer and most of September. Now it's too cold and I closed the window although I haven't turned on the heating so it's still much colder in that room.

I took the picture again without flash and I think you can see the change in color better now ---you can see it's turning yellow.