The original sketch? Heh, I can't honestly say I care for it much. Posted alone, I'd find something nice to say, but it looks like just another overworked fanboy pic.
But, the 3-D model you've started, oh my! Without all that cluttering caused by panel lines, that primary hull just pops! It is wonderful! I like bold shapes and this one's got 'em. Keep the surface as clean and simple and elegant as possible, with just the faintest lines suggesting hull plates and panels.
I really don't have the words to say what I like about objects, so I just sketched some comments on the pic.