I still have no idea what you are representing with the shading..... what kind of 'rule' do you use to see where it should be shaded?
Sun appox. bows on about 40 to 45 degree above the horizon line for above the waterline shading, ship generally heading east. When doing hull, I am still experimenting. My current rule is darks for curves, lights for flats and where you have roll dampers, either light or dark depending on hull base color contrast.
Making the mast spars three pixel thick instead of four/five might help a bit. Try also cutting down the funnels in height or make them thinner.
Making the masts thinner certainly would help. The funnels? Really? Must be for the wind breaks. I thought the funnels generally were so light in construction, they had to be guy wired in place or they would be carried off with the first stiff breeze. Not as much mass as the masts.