Say "Please talk to me for a bit, I enjoy our conversations"
Forget the "please, and I crave your company" because it makes you sound desperate. Just talk to them and be yourself without begging.
Self control and with time
Say.. “your face... I like that ****!"
Don't be so obvious. You can say exactly that without actually saying it by engaging them with private messages/friend requests.
By first smearing lipstick all over your lower face and tangling up your hair and crying so that your mascara runs