Concrete Advice #3: Omit all of these: "it's hard to summarize myself" "what should I say here" "I'm contradictory" "I'm nice" "I'm shy until you get to know me" "the first thing people notice is my eyes" "I need [obvious literal things] to live" "if it were private I wouldn't write it here" "you can ask me anything" and explicit suggestions that the reader should date you, even tongue-in-cheek

That advice deserves a prominent sidebar on the OkCupid profile editing page. Most profiles have at least one of those.