So first of all I've looked at these two textures for the metal. I decided on my last design to do the top of the lighthouse dark grey metal, but because it is old I want to add a bit of rust texture.
As for the lighthouse stairs, I want them to look like stone and warn away.
I also found a picture what the lighthouse paint could look like. I don't want the white to be too weight or the lighthouse will look too flat.
Another thing I'm working on is the light. Now originally I picture the light to be half covered up so i would only shine in one direction, but when looking online I found mainly lensed lights.