The image will fade. This happened to us just a couple weeks ago, too. Deer just ran into the side of our car on the way home from a football game (about 10 pm) and he got up and ran off too. Like someone else said, deer are very resilient animals and if it was able to walk off, it was ok. Don't fret any more about it, just watch on the roads-there are so many out there just trying to get run over! We had seen 6 in different places by the road that same evening before the one that hit us
! Take care! Glad no one was injured and no car damage, either!