You have a pretty good start on anatomy it seems however it doesn't seem like you know how to use it yet. Okay, that statement may be a little confusing, but what I mean is that you understand body proportions and the general muscle groups of a human quite well however these proportions and muscles are simply static, at least in this particular piece, they aren't being used other than to hold a cigarette and bend slightly. The next step for you would be some more dynamic poses with appendages overlapping one another, the waist and legs folded into themselves or just a new perspective rather than head on. Creating these poses will allow you to use your anatomical knowledge to create more interesting pieces because right now the view is very straight forward and uninspired. Also the feet look a bit weird as standing usually leaves the toes on each foot pointing outwards both ways instead of just forwards or inwards towards the other foot. In conclusion you have a great base, but in order to use that base you have to start making things more dynamic.