I really like the message of your PSA. Though there were no words spoken, scripting is very important. I gathered that the driver was picking something up at the drive through and they were asking where she was but I was a bit confused because there wasn't a shot of her driving away. Spending time on developing even a visual script, I think you would have caught the need to have that shot which would have made all the difference in your message. Keep at it.

A great idea to use stock footage and a great way to get some production value. The only catch is that with the other footage you shoot and the photographs that you put in the PSA, really needed to be higher quality so that I as an audience member wasn't taken out of your PSA. Also, the context might have been better if you had the girl driving down the road vs. stopped at a drive through window. You could have used that shot but I would have added a shot of her pulling away driving.

I'm assuming that you weren't able to shoot footage of the last two shots which is fine but don't take that as though you can't still have movement. There are lots of documentaries that only have photographs to work with and they still create movement over the photograph. By pushing in or pulling out on a photograph or by moving left or right you can still really effectively guide your audience where you want them to focus. You can also create emotion that way. Just something to try next time.

I certainly understand having limitations and I think what you've done here with using photographs works and can be effective. Working with that, make sure that you use photographs at the highest resolution possible and if you have a photograph that just isn't high enough then I would strongly suggest finding another choice. Your photograph or screengrab of someone that is morning is critical to the emotion of the viewers so having it be less resolution took this viewer out of your PSA.

I like the concept of what you're going for here with the silence and then only using sound when it comes to the accident but I think you can have the same effect had you had a quiet bed of music or maybe even some sounds in there. Having it completely silent makes it feel like a mistake and had you some very subtle sound design throughout I think it would have still worked and most likely even better. Keep at it.