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Introducing blacks down here (effectively strengthening the shadows) might restore the visual balance and prevent the eye from going straight to the stack.
Good idea Mike. This is one thing that people tend to forget. It is all relative. If you think you may have an area to dark in a drawing, try darkening other areas to even out the balance. As a drawing nears completion, I look at the entire image in terms of balance. Sometimes it helps to view it in a mirror or turn the image upside down to get a better sense of the balance for the entire drawing.
To really make things "pop" try not to over use your darkest and lightest values.
Still, I think the smoke stack could use some value changes to make it more cylindrical. If you can't remove any graphite on the stack, try going even darker in the "core of the shadow" area of the smoke stack. By the way, you may have a hard time putting charcoal or carbon over graphite. It is much easier to put graphite over charcoal or carbon.
I really suck at photo shop but I messed around with your drawing a bit to show what I mean about core of the shadow on the stack. I hope you don't mind. Notice in the first one how the stack looks more cylindrical.
J. D.
J. D. Hillberry
http://www.jdhillberry.com