I like the bridge construction and terrain as well as the variety of characters and unique camera position. I think you are on the right track with the time of day to set a good mood for the scene as well. I didn't have any problem understanding why the zombie was being knocked off the bridge. Particles might help some people recognize the action.
I have some suggestions, but don't want you to take them as hate, rather, they are constructive suggestions that you may use.
The light sources are wonky. Where is the light coming from? There is a torch, but it's not making any light, instead there is a strange magic light a little ways to the side of it. The shadows would be better with improved lighting.
Without animation, you still want to tell a story. The good guys have swords and bows, and do not look to be in a lot of danger from a couple of mobs. Try using more mobs approaching from the distance or defending the goal to cross the bridge. One of the characters is hanging from the side, in the background, but for no clear reason. If you put some fire or explosion damage at his location, it could be more interesting.
I would not make so many comments if your work was not worthy of it. Keep up the good work.