If you haven't already, read and consider the suggestions on the Home page. Consider does not mean make your profile exactly like this - leave in your personality and opinions for what is best. It's your profile, after all.
Take the Profile Length Challenge before continuing: Play this song or one of similar length that you won't get sick of. Start editing your profile at the beginning of the song. When the song ends, stop wherever you are and go back to the top of your profile and proof read it from the beginning again. Don't stop until you can read your whole profile without needing to make edits before the song ends.
...Okay, now you may proceed.
Some sections may hurt more than they help by giving superfluous information. This varies for each person, and depends heavily upon the sort of audience you want to attract. Consider keeping your profile concise by cutting an entire section which is redundant or irrelevant when you take into account the audience you are writing to. For me, the "First Things People Notice" section is not defining for the people I hope to have message me, so to save their time and mine, it could be cut out altogether. Find the balance between giving yourself due credit with information in your profile, but not giving extraneous details. Whoever you hope to keep reading and have message you, consider what overall effect you want to give them, rather than fine tuning each individual section to be the best it can be as a stand-alone text box.
Brought to you by /u/FlightsFancy.
Your username may not be as important as your profile, pictures, or compatibility scores, but it is a little off-putting when someone named "hookerwithapenis" has sent you a message. (Not making that handle up, I swear). So, a list of protips to think about when creating a username:
Be creative. First impressions count, and your username is one of the first things potential dates see (even before your profile picture). If it is funny, memorable, or highly descriptive, your chances of getting noticed go way, way up.
Do not use identifying information. This one is just common sense, but using your full legal name as your username? Not advisable.
Avoid using combinations of seemingly-random numbers or letters. "723408," I'm looking at you! Creating a username like this makes it tough for people to remember who you are. Remember, you're picking an online name for yourself, not a new PIN!
Don't freak people the fuck out with a name like, "axemurderer4hire" or "luvstalker". Maybe you think it's funny or ironic, but thanks to a few prominent stories in the media, a lot of people are skittish about interacting with strangers from the intertubes. Be sensitive to those concerns.
Keep it short and snappy. If you pick something that takes a while to type when you're logging in, you have likely chosen a username that is a little too detailed.
Alliteration is awesome. There's a reason "DebbieDoesDallas" is memorable. (Okay, several reasons. But you get the point, right?)
And my final protip: spelling and grammar count. This goes for your profile, too, but if you can't get a few short words right ("GrateGuy" or "HunnyBunns"), it's a red flag to your potential dates that your profile is going to be hard to read, and even harder to understand.
Keeping an audience entertained is key to getting more time out of their busy day for reading your profile. Not everyone in the world is gifted at making people laugh with thoughtful jokes in an online profile (I know I'm not!), but thankfully there are other ways of amusing people.