Nice poster. I would say that there is some negative space on the left side (which could be fine if that's what you wanted if not I would suggest simply cropping it out), the lighting looks a little unnatural (I'm assuming you wanted a sunset in which case I would suggest increasing the ambient strength to fill the whole poster, use another light to balance the strength evenly, or use photoshop). The follow are more minor complaints: adding a cigarette smoke particle effect, try fixing the lip so it doesn't look like the cig is clipping through his mouth (though I've had trouble personally making this look natural), fix the clipping on the left index finger, and lessen the head room.