Yeah, an ostrich head not a generic bird - unique as birds go. I wouldn’t use just the letter N. It communicates nothing. It’s an acronym after all and focusing just on the letter N either says nothing or says “Notes” and the protocol is and can be much more than that. Personally, if there’s to be no ostrich mascot/emblem, I’d prefer to see the NOSTR acronym used in full and for a pair of stylised keys to be incorporated. It’s not an app so try not to make it look like one.