You demonstrate a very cool and unique style that doesn't get in the way of the realism of the drawing, well done. I especially like the partially erased wrinkles and furrows on his face. If memory serves, Walter White's (or Bryan Cranston's) face might be a little bit wider and he may have a shorter neck as well; he doesn't seem quite as sturdy in this picture. I think you could have done more with shading on his face, most notably the nose and temples, though I understand that you only shaded areas that were of a certain value or darker. Things that I like: His expression, just that penetrating look of disdain or perhaps disinterest that Walt carries around; your outlines, especially the glasses frames and shirt collar, are really well executed; and finally your hatching, as I'm envious of someone that can draw facial hair that well and you really created a kind of theatrical look to him that way. Overall, very well done, especially given how iconic and recognizable that face has become in recent years. I can't request critiques myself but I'd appreciate a once-over and any advice you could give. I look forward to more from you in the future!