I find that introduceyourself posts where people actually take the time to mention things like a few hobbies, their interests, what they do to support themselves... those definitely grab my interest. And if they mention who or how they discovered steemit I think that is an interesting aspect.
Things that don't work for me- a single photo with almost no personality and nothing written in the post. If your personality is mostly selfies and you cannot string 3 complete sentences together, that is a big Nope.
Today I found- @sabrinferno 's first post interesting enough to follow her, to see where she ends up.