Help! I need some tips and advice on facebook!?

So this may sound dumb, but i want to get more 'likes' and comments on my facebook profile pictures. Some of my friends and peers from my school get 20 likes. Some even got around 80 on one pic! I usually get around 4. Also, it's not like i dont have friends, i just never get any comments or likes and i want to know if there is a way to get more? any suggestions or tips?