Here's my rough next to Brent's final. I like what he did with the Cap'n.
I like the Cap'n as well, but the final box looks a bit odd to me (the perspective narrows a bit too fast mb?). I enjoy being able to see the side and/or top of boxes if possible and love it when there is something on the side that adds to the gag -- it's like a bonus of some kind. My favorite example of this is the
vintage 9th series G.I. Toe (one of my favorite Wackys ever). The idea of giant toe with legs taking out a gorilla is so completely off-the-wall!!
I also like the fact that the Cap'n is saluting (a neat touch imo and makes him seem slightly crazy!), and the gears-as-shoulder-insignia is a great detail!
P.S. I just noticed on the box side in your rough are the words Crush, Kill, and something else (Destroy mb?). That's the kind of extra detail I enjoy!