I have loved looking at everyone else's photos trying to play the roo vs. pullet game, and now it's my turn. whaddaya think? This is a 4 week old black copper maran. S/he looks very different from the other two I have.
Could you post a full body pic of him/her standing naturally? Your chicken does look like a pullet for now, though it is too young to be sure. Might not be BCM.