Photorealism is all about lights/shadows and how realistic you build your materials.
And of course the function or lack there off, off the geometry that's in the scene.

Ask yourselve this

-What's the ship doing there andwhy is it powered down?
(maintenance /stocking supplies/change of crew)
the answer to the above question affects the shape and form of the dockinstation


-what is the placement of the station /ship within the part of space( i.e. does the/a sun resides behind or in front of the ship and how far is it, as your station isn't closed off to outer space this would affect the lighting dramatically.

- that domelighting is not very realistic it is okay looking but it will not push it towards realism

It looks like a great start though keep it up