Hey Sean, it's very hard to critique your work since it's usually 99.999% of the time FABOO! The only thing here that seems off to me is that the capes for Bats and Supes are flush with their body lines so there isn't any depth on their shoulders. Mabe if you darkened those outer lines or maybe raised the line of the cape off the arms to make it look like it's draping would cure it.

As I said, your work is always great to view and I love your point of view on characters and your simple line work that conveys much more than you'd expect.

Love that Nightwing!