Interesting about the funnels, I thought it was done to make sure the fumes from the funnel in front. doesn't hit the funnel behind it.
The shading in the bow, some you probably have seen on many drawings on the internett, they are exaggerated, the hull shape of Olympic class but also similar style ships, doesn't have that exaggerated shape of the bow, where it suddenly after the bridge goes 45 degrees in for the go voer to be almost flatt, just some purpose build ferriers/ror-ships do that, and that one cruise ship with that weird bow shape, that I can't remember. I can literately head into the city and take a picture of a ship that have similar type of hull as Olympic class (just on a smaller scale) build in the same era, to show how almost flat those hull shape are.
I did find these, after a fast google search!:
This one you probably have already seen, but you can still see the hull shape:
http://www.titanic-cad-plans.com/olympic/
Picture for how to (sort off) shade the Olympic class, you can easily see the hull shape:
This model is not precises but it give an indication to how the hull look:
The best drawing I could find: