FSX:SE Improving the looking of (Big) Interiors

So, this is the current state of my small project, I made some improvements on the textures and geometry of the hangar, but I can't get the "right" feeling of it... like it's something wrong about the lighting (and really FSX is not made to make these things...) What I can do to improve the interiors? Can I adjust the materials/textures to simulate better the indoor lighting?

Thanks in advance guys :)