Try to put light landmark dots on the page, lightly erase everything with a paper tissue, measure, compare, and add new landmarks in better locations.
While comparing now with the reference, discovered I've forgot to add a couple of details to the main mast. After some thinking, I've clipped the paper back on the drawing board and had another pass at it :-)
I've drawn from this reference a couple of times already, maybe I manage to get it right at some point. Photo reference by Francesco Ungaro from Pexels