out of this world man i love the shape of the 2nd picture. i'm a high schooler too and i couldn't agree more with what sketch said.

As a huge science fiction fan I do not have any problems with the great number of sf motif pictures generated in 3D.

What you have done is good. "Earth Guard" is a great composition. The ship's form look good. But as stated earlier the textures leavs a bit to be wanted.
But the Earth background is well placed.

The Picture "Battle ships" is the one who cought my eye. There is a hint of power in it. But two things bugg me a bit: The over done lightning and the weak textures. The ships look pale and lifeless in their shininess, if you get my drift here.

But any of this is not something that will not go away with continued creation so not to worry at all. :-)

very nice reminds me of a rpg