First of all, that's one really cool design you've made!
I love how you've done split the front into 2 seperate spires.
To add more detail, you could indent/outdent parts of the armour, add ribbing and do some more work on your engines.
For engine work, I would suggest you head over to the Engine Porn thread:
Engine Porn
Good use of extended/indented engines with back lit ice and sometimes pulse effects can create some pretty spectacular looking engines!
Simply indenting the engines, putting up some lights/ice crystals, a gap then a layer of ice can look pretty good. Alternativly you can put down your base lights then use wedges to create outlines to make them not look blocky, like this:
Pulse engines also look very cool and leave a trail!
If you would like advice on how to do some of these feel free to ask!
(Do check out the engine porn thread though, images came from there)