This is better than most "cathedrals" I've seen, but there's still some work to do.
- The front door is way to tall. Make it small, and maybe add a rose window above it.
- The towers aren't tall enough. They don't need to be pointy like Conan said, (just look at Notre Dame de Paris), but they should definitely be a bit taller.
- The roof shouldn't be flat. It would collapse immediately if it was real.
For a more gothic feeling you should try the following:
- Add a choir and an apse in the east end!
- Make the towers pointy.
- Add a large tower in the crossing between transept and nave (for english style), or simply add a spire (for german/french style)
- Add larger, multistaged buttresses. Not only do they look cool, they actually support the construction.
If there's anything more you wanna know, feel free to ask me. I learnt alot about cathedral architecture when I built mine.
Here's a plan if you didn't understand what the hell I was talking about

