This suggestion is for aesthetic purposes, but having an avatar that looks unprofessional will only serve to make you appear unprofessional, and that's no way to increase the number of people following you. Since the avatar is simply a small picture to represent you, work within those means. In other words, don't try and squeeze in a picture of you and Mount Rushmore in the background or you in a room with your 14 cats. The point is for someone to see your face, so stick to that for best results. Make sure you crop the photo because it will end up being about the size of a quarter. Here's another tip -- upload a large image (450 by 450 pixels) to send to Twitter and let them shrink it for you. This way, if someone wants to zoom in and enlarge your image, it won't be a pixilated mess. Now that you have a nice, professional looking avatar, people will never be confused again about who you are or what you look like.