I loved the original image so I feel a bit bad about literally letting birds sh!t all over it. But heh, I'm trying to tell a story here !!!! ;)
My final edit was done in LR using an existing preset called 1975. Which may be cheating but I only have so much time!
The bird poo and dirty windshield were added images as well as the cat you might recognize. All were put in using masks.
Maybe I'm not approaching this PPchallenge correctly. I'm known for going bouncing in and out of the box on occasion.