Is there some underlying New 52niverse mandate that DC Comics holds all artists to, requiring all characters to appear like they’re 21 or younger?

The best description of Trevor McCarthy’s Batwoman Annual #1 cover comes from facebook user Chris Desatoff:

Skullbrain has a gun with a bayonet, yet he swings it like a bat (and holds it in a way that he’s likely to slice himself open with the sharp, pointy end). Other than that, it’s a cool drawing.

I have no idea if this book is good or crap anymore, I haven’t touched it since J.H. Williams III & W. Haden Blackman left over editorial interference.