Online, make the feedback form easy to reach and to use. Create as many funnels as you can to create a steady stream of comments. Once you have feedback, read those comments. Thank the people who tell you things, especially those who make comments about what they dislike. The pain of hearing the truth in the short run about your background, or images, or text, will bring you long term success.
Comments are good.
Compliments are nice, and they can really lift once's spirit at times. However, if I had to filter out every variety of comments except one, I would take complaints. Not because they are fun, but because they challenge what I think about my presentation and content. Even if I quickly decide my complaining visitor was simply blowing hot air, my web page benefits because I must shift my perspective for at least an instant to see if the complaint is legitimate. If you can entertain the possibility that a complaint is valid, you are willing to experience growth, and growth is the only way to advance.