The ship in the right hand corner looks a bit jaggy and out of place, also I would have blured some details in the background, but I am loving the atmosphere and the little details ( the fire looks amazing ).
*MarkJayBee is someone that you should check out as well, great guy and I'm sure will be more than willing to help you get started and with any tips. He has a much better understanding of the program than I do, and is relatively well integrated with its user community so will be able to point you towards useful tutorials and the like.
WOOW ! Damn !! This guy is completely amazing ! He's got a very high skill with this software, his creations are very awesome. I can't believe it... Thanks a lot for the information mate, I'll ask him to give me some useful links of course. But it will be interesting for me to create some abstract shapes first.