The rim lit could work well, give a little bit more color variation to a predominently cool pallette (which isn't by any means a bad thing)
The bowl of milk for the boss cat sounds cool! Ha Ha Maybe he's one of those henchman that serves as the boss's personal assistants like celebrity's have? He makes do him do all these mundane chores like carrying around kitty litter and having to accompany the cat to manicures! He's disgruntled because the cat lives a better live then him and all the other henchman! :p
I am thinking since he has a diagnal strap possibly trying to do something with a backpack. It might push the silhouette if that's something you'd want.
The goggles and bundled up turtle neck definitely makes me feel that this guy is a henchman guarding some facility or compound located in a very cold area. An addition of a gun might be good. I would possibly toy around with the idea of a headset and turning the visor into something that projects data from other henchman and home base so he is in contact with them.
You may want to experiment with refining the left side of his arm. You should probably take that with a grain of salt as it seems to work pretty well right now so that may just be a personal choice, it could work either way.