I know (self credited I know) a decent amount about late 19th, early 20th century design ships and I can give you the following advice;
- Your main gun turrets are far too close together to both each other and to the superstructure. The blast from those guns will destroy their neighbouring turrets if they could even revolve as it is currently
- Your main mast should be larger and not enclosed for ships dating back to the interwar period or earlier. Fully enclosed structures like that were not common beforehand
- Whats the space between the funnels for? Even on a battleship, space is very much limited. You want the design as compact as possible to reduce the cost and amount of armour required to protect your ships vitals
- I notice you have what look like directors atop of the masts. What happens if they fail? Have redundant directors for your main and secondary weapons. Also have a spotlight aft as well in case a shell takes out your current arrangement
- Your hull, whilst it looks nice, has a bit more freeboard than I would consider standard for battleships. They tended to have low hulls dating back in some way to the monitor and pre-dreadnought days
- Will the ship be fitted with radar? If so, think about where it needs to go and what equipment and support structures it needs to operate
When designing a ship, always keep in mind what your enemies or rivals have and what you need to overcome them to the best of your ability. I find this article here of excellent reading to understand the work you should do in your mind BEFORE you ever even start drawing a single pixel;
http://navweaps.com/index_tech/tech-035.htm
Hope I don't come across as harsh. If you look at my AU thread you will see my first battleship also had many of these errors. Research and understanding the requirements for them will help you improve greatly.