Ah yeah, I see it now, on the nose there are two sharp angles, where as I have rounded it. I am going to spend more time in the planning stage, and work on being less heavy handed. I tend to rotate between black and white images and colour, as to develop value matching and observational skills; if I was drawing from a live model, I would have to be able to identify these values as I wouldn't have access to a black and white image in that situation.
With that in mind, on my next study I will have a black and white and colour version of the next reference to help me. I would also like to create my own lightsource, so I will draft some thumbnails, and potentially alter the composition and background slightly to begin thinking creatively.
Thanks again for the critique Ascent; it's always much appreciated.