A guy on Twitter asked me that recently.
My reply was:
Judge a model by what she is modeling, u are not a model until u actually model something. Being hot doesn't make you a model. And also: There are ways to market yourself as a model that will help you, then there are the ways that just leave you staring at urself on a screen
Putting your photo on the internet and calling yourself a model can actually be a risky way to promote yourself. If you want to model, seriously, you need to get some quality photos taken, or a nice headshot or face shot and mail it to an agency in the postal mail. No other way is honest. So do it legit or don't call yourself a model.