I was on a few dating sites a couple years back and here was my experience: I would receive anywhere from 5-50 messages per day.It gets tiring answering the same questions repeatedly, so the ones I wasn't immediately attracted to would get ignored. The guys would have ambiguous profiles, or have a characteristic I wasn’t looking for.

Find something in her profile you identify with and comment on it. Ask her questions, it shows you're interested in who she is, not just her body.
When you just write “hey” to a girl, you haven’t actually started a conversation. For a girl, replying to “hey” feels like work with no pay-off in sight.
Or will this be like the other 1,000 “hey” conversations that felt like pulling teeth and went nowhere interesting?
”Maybe she has a pic of herself wearing a big hat or a colorful scarf.
In the online world “You’re so beautiful” makes me roll my eyes and assume you type the same thing into every message box. I only respond to messages that show the person read my profile. Creepily noticing what time I’m online and asking me about it… I rarely get along with people who take themselves too seriously.
I hope you never get laid again.” I resist the urge.
You’re not even showing interest in anything specific about her.
Should she just say “hey” back and hope that he’ll start a real conversation? You: Just watching TV.[Girl stops replying]When you just write “hey,” you better have one of the best profiles she’s ever seen.
That little profile photo of you makes a big difference in the way girls “hear” your messages.