wow!
This is very very good. It obviously took a lot of work to make this, I think. The drawing is very good, the animation is certainly amongst the best on this portal. Stylistically it is quite realistic; the choice of black and white line drawings with red for blood was interesting. It highlighted the action in an understated way. Quite minimalist, bringing in elements only as needed. Storyboarding is very strong. Great perspective shot on the crowbar.
The story is your standard "Night of the Living Dead" zombie fare, but it is very well done. Starting with the car crash is inspirational to build up to the zombie twist, reminiscent of the beginning of the Romero film. Again, understated and good.
Sound and music was well chosen and utilized.
I am amazed that this would be your first submission. Traditional animators' style. As to weaknesses, really none -- this was very impressive. I might work a bit more on facial expressions, as people really focus on this and it is easy for them to become cartoonish if you're not careful. Also, consider varying your brushstroke touch for added nuance.
Great Job!