How would I go about adding a 2D texture for windows on a sci fi space ship

I want to save on geometry and I basically want to add windows into my model as only 2d texture. Thing is I dont even know what tool to use. Should it be all shading texture nodes. Or should the window be based on a face and then slowly influenced by nodes to create window. Should I just take a image of a window and paint it onto to the face. What is the best way?

Hi, you can paint or add as texture its your choice, but you will have to uv unwrap first. here is a good tutorial for adding texture image :

Ok thanks for the reply I will unwrap it first and then probably put it into photoshop and add the windows.

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