Most Helpful Guy
It probably relates with your attitude and behaviour than other physical aspects
Most Helpful Girl
In my opinion it is almost the same thing. I feel like girly could mean that you wear dresses, etc. Feminine probably means about the same thing. But I feel like femininity and classyness could go more hand-in-hand. You could be girly, but you curse or are promiscuous. But you are feminine/classy by sitting up straight, don't use vulgar language, etc. If that makes sense.