I don't suppose you've ever played Homeworld, have you? This ships reminds me vaguely of a Firelance Ion Cannon Frigate from the game (here's an image [link] ), though that's largely due to the perspective depicted here. I'm guessing that the front closes in when the weapons are not in use?
Getting there mate, I'd say this is your best work yet, looks very pro. My only crit on this would be a lack of distinct forward and rear - due to a lack of perceptable engine array and cockpit area. It's ever so slightly on the abstract side. Keep that in mind with your new stuff and you are quickly on your way