Thanks so much for the suggestions Wes and Pistachio.
After your comments I realized that my scene was a little too unclear about the tunnel's location.
The tunnel was supposed to be extending out of a building in the foreground, hopefully my update fixes this issue with perception.
I also updated the walk cycle with more bounce.
And I did a little refining of characters (the ones offset above), as well as cleaning up the green monster a little bit.
Additionally, added a vehicle design.
Thanks again for the help guys, and as always, suggestions and insights are more than welcome.