nice shot, anything under 20 yards i can hit quarters almost all day long. the ear hole is over size of a half dollar. If your comfortable taking the shot, take it. The brain is certainly a clean quick kill. I saw on outdoor channel of hunters shooting the neck of deer. more chances of wounding the animal in the neck than the head. By all means however, if you have a clear shot to the vitals, take it before attempting a shot to the head.
Im not trying to cause an arguement, just my .02 cents.