Watch Out for Red Eye
When there's less ambient light--as on these chilly autumn days--red eye comes out to play. As you probably know, red eye occurs when eyes dilate to see better, but the camera flash fires and reflects off the retina.
If you have an external flash for your camera, try to "bounce" it by aiming it at the celling instead of straight ahead. Or use an attachment like the Lightscoop
to bounce the flash that's built into your camera. Of course, you can always use your photo editor to remove red eye after the fact--most image editors these days have a red-eye removal tool built in.