It does look lean. there should be a tan fire ring all the way around the porcelin about 1/2 way down... the ground electrode is too white...should have the timing mark at the bend,,,cant see any from the pic. posted
a little on the lean side and perhaps you have either too much timing or to hot of a plug. Syclone hit the nail on the head. The dark band should be at the bend. Can't tell you which circuit needs more fuel though.