I decided that the old model of U-51 posted earlier (see below) is below standard. Note how blotchy the skin is, and how many of the hull lines are too sharp. I am in the process of replacing it; meanwhile, external work on the UB-1 is virtually finished.
I used to be in favor of gritty, heavily shaded skins - now I am reconsidering that approach. Studying actual photos, many ships have very smooth paint.
@Keltos - thanks for the pictures, but TBH the oldest ships I am planning to make are Pre-Dreadnoughts and Armored Cruisers from the 1890's. Ships from, for example, the 1870's that would have been used as hulks are low priority until I have a good lineup of more modern units.