Extended Dark Knight Trilogy Concept Sketchdump

Sorry anyone waiting for a TDK Epilogue page. I thought maybe I'd at least drop you guys some crap that's in my sketchbook. The stuff on the left are parts of definite pieces I'm doing. Some take place in Epilogue times. Some take place during the Occupation of Gotham (while Bruce was in the pit) The stuff on the right is me trying to work out Killer Croc, Red Hood, Riddler, and Penguin. As you can see, none of them are all that spectacular since they are in mid-process what each one will look like, ultimately. A lot of people throw me a lot of great ideas.. but if I can't work them out aesthetically, then it's hard for me to move forward. Some notes on them..

Killer Croc - I'm a fan of what Croc looked like in Azzarello's Joker Graphic novel. And although I made his skin condition way more pox-like, it's still a little too similar.
Red Hood - I imagine him wearing some kind of modified motorcycle helmet. Nice and simple.
Riddler - Still have the williamsburg version in my mind. But this is way too Walter White. I'm close to getting a good design for him.
Penguin - Trying to get away from the Arkham City design because I love it so frickin much. And unfortunately, not happy with anything I come up with. I DO know I have an idea for his monocle. It's a high-tech Jeweler's loop that analyzes and records shit. That's the only aspect I know I'm keeping. Everything else might look way different next time around.