I would have cropped this more severely to avoid the bottom and extreme left side of the image. Color is good. Focus seems fine to my old eyes. As I've said elsewhere, this challenge is pretty weak...making it difficult to have an inspired photo.
I gave this a 6 in voting - I liked the different approach by using the rear view mirror. Also like that you were wise enough to reverse the image. You could crop just a wee bit off the bottom, though I do like the shot framed.
I scored this a 5. Overall this challenge was very uninspiring. Good focus. Lighting is a bit off but in a car what can you do. I may have cropped off more of the bottom and kept the shot as the mirror alone. Overall average shot.
This almost feels like it's playing with the old sexist saw of "women doing their make-up while driving", but it's not quite playful enough for that. If that was what you were going for, I suspect you've been only partially successful. Unsure about the decision to flip the image, as well.
If you used a full mirror this would have been better, because the space at the bottom is negative space that doesn't really enhance this...the light and colour are nice