I have found that one of the best ways to get noticed is to look for other people's posts and engage with them. ie. upvote the posts you like, leave comments, resteem, and follow their blogs. People will notice you if you're everywhere. :-)

Most people on here will return the favour. It's best to expand your circle and not just stay within the few people you know.

Your reputation score will only be affected if the account that's voting for you has a higher reputation score than you. If they have a lower score, it doesn't affect yours at all. The amount of Steem power they have also makes a difference.