Love this one! The color is PERFECT it definitely has that retro feel! i dunno if that is what you were trying to do, but thats definitely the blue i remember from back in the day, like the days of "SuperFriends"
I actually really like that first Joker pic. It's very simple, yet it's a nice nod to his look from TDK in an animated form. The second one went a bit overkill with the detail on his face, but it's not bad.