Ok, first of all: JPEG Compression! that thing is 283Kb, I ran it through a compression program and got it down to 38kb with no quality loss. Something to bear in mind for the future

Now onto the render. It looks
really good for a first attempt. You've managed to get the engines and the beam looking very convincing, although obviously a little work needs to be done.
Good use of background, the planet looks neat (although the bright atmosphere edge looks a little dodgy). Nice clear nebula as well.
You've even gone to the trouble of changing the alignments on the guns (something I can't seem to manage at the moment) attention to detail is good - nice one.
All in all - an excellent first render, good job
