You're about approximately 98 merits(as of the time of posting) to be able/eligible to wear/put on an avatar
Only full member and above rank are eligible for an avatar(eliminating the newbie, Jr member, member rank)
While a signature is eligible to JR member and above(eliminating the newbie rank)
1. That’s wrong, he can wear a signature as he’s a copper member.
2. Your reply seems to be more confusing than useful at this point.