as far as i can tell, technique is solid. i think it falls apart on the sub-optimal resources here, specifically the render. Lacks in depth and flow, render looks separate from the rest of it. Despite, frankly, a bad render, good work with the light and as i mentioned, smudge technique is good and you should trust in it and avoid oversharpening.
I am sorry for pretty shallow insights, it's been a while since i've given any cnc on signatures.
Also, ditch the render and you should have a nice abstract smudge piece