let me visualise it:
left is how the shadings shows it, right is how I think it should look a bit. only the main cross section is about correct, only the bilge strake (the round part of it) seems to be to small.
following the 45 degree rule, the bow should have no shading at all, as it is nowhere more then 45 degrees. the stern should have an unshaded part at the bottom, where the skeg goes near vertical again, and above that an part shaded, where the bottom of the ship is near horizontal, making place for the propellers (how big this part is depends on the ships shape) and above that hull goes to vertical again. above the waterline, nothing should be shaded, unless there is an extreme flare in the bow, which is possible but I don't think is the case.
with other rule sets (30-60 degrees are sometimes used, or 90 degrees, shading everything that is not vertical) the details change a bit, as do the shapes I drew representing your shading (I drew the cross sections as if you used the 45 degree rule)
if this dazzles you, I suggest going back to 'regular' sb shading, which might look a bit flatter but represents the ship more correct.
EDIT: also, your shading under the bridge overhang and the overhang behind the lifeboats does not follow shipbucket standards.