I think it's an excellent first attempt, especially as I think you've started with a difficult image that appears to have very flat lighting - shadows help to define the shapes.
No doubt you can now look at it and find fault, so you don't need me telling you what I think is wrong (which is very difficult anyway without seeing the subject), but I will say that as a piece of art the tonal balance needs some work - the hat is much denser and is overwhelming the face.
I have a book that I have found quite useful:
Drawing on the Right Side of the Brain, which stresses the importance of drawing what you see and not what you think you see, so be careful with advice that there are "rules" to drawing people- maybe try and use them to analyse your drawing: i.e. Where is the edge of the mouth relative to the eye?
Kevin