Comment on how attractive she is. Yes, women do want to know they are pretty, even if they’re online and you can’t see them and have no idea. So in your communications, ask questions that would help you know, but in an unobtrusive way like – how do you wear your hair? And then say how attractive that must look.
Point out nice things or the lemonade in life – nice things the other person has mentioned, nice acts the person has done, good things on the news latterly, etc. Be upbeat, and forget those lemons in life. Even in email a person can shout, by using all capital letters. So show manners and kindness. Keep swearing, unkind remarks, prejudice, etc. out of your communications. And “do unto others….”
So add some helpful real-world tips that do work (a lot of the time anyway) into your online dating equations. And come up on the positive side of romance – and enjoy more lemonade!