Well teaching somebody to build is actually a lot harder then it sounds. Everybody has his own set of preferences towards turrets (size, range, lenght, ...) and in most cases all turrets from 1 person would reflect a basic concept design he uses, knowingly or not.
I can't really see the total shape of the ship but from what I can see it looks like a flat topped ship with a hanger, bridge and a garden in it and very little detail on the top or the use of any other color besides black.
(note this is not criticism in any way)
I would say you can at least put 3 medium turrets on the top (2 on the back, 1 on the front) and 2-4 smaller ones as anti fighter defense (in front of the bridge left and right). After that I would put some detailing on it to make it look less flat.