Before you do all that canvas texturing you might consider this for your original image: When I imagine an oil painting in progress I don't imagine that the artist started at the top of the charcoal sketch and worked in finished detail until they got to the bottom. You started the idea with your smudged edge, just take it further. Consider letting part of the chair only have a few intitial layers of paint or have the lower part have a little more base coat before revealing blank canvas and charcoal. Nice lighting! good luck