If you're trying to be an indie author, the first thing you need to do is change your Twitter photo. Do not take a picture of yourself with a webcam. Do not scan your High School yearbook photo. Take a nice head shot. Otherwise, you could wind up looking at me with googly eyes while I'm trying to enjoy social media.
Michele Bachmann Eyes
Always double- and triple-check your photos before you upload them to Twitter. Have a picture of your face taken by someone who likes you. Look at yourself in the mirror and practice your author pose. If you don't do this, you could end up with Michele Bachmann face. Don't have profile that looks like this picture of Jon Stewart. He's making fun of Michele Bachmann here, but I see people on Twitter who look like this all the time.
I also see a ton of profiles that look like this. If you want to sell books, don't run around Twitter with an egg on your face. No one will take you seriously.
Choose a flattering, benign image of your face. Don't be super-sexy or scary-looking. Don't be way too serious, either. Try a small smile, and just use a simple image. If yours don't look like this, you need to change your Twitter photos.