Looks pretty nice, although you might want to consider making the Nyx and the Pytho lass fat , as they are like someone fed tons to the current models Also, since you are using textures with detailes ( lines and trims and all ) you should try to make them simmetrical on each side, cause it works on large ships if they are not, but small ones are easy to notice. If you need any help, poke me on skype
Edit: I've just noticed , there is a hole at the nose of the Pytho and the intakes/grills and wngs of the Nyx could use some serious polygon reduction
Edit #2: There are multiple holes on the Pytho , while the Nyx main body could serve a good base for a Tigershark replacement model ... just playing around with ideas
Sadly I prefered old version of civ models, more similiar to CR. This ones are just bad and look bad in my opinion - they are way too complicated, I loved simplicity in old ones.