I'm gonna do a little of Sushi's job, because I can see a few minor but rather blatant problems with an otherwise good picture...
The beams from the Sathanas are red, however the beam glow is blue, and theres that ugly line between them bother, you really need to fix that if you can.
Lower the lighting a bit, and make the texture properties on all the ships less reflective, as you can see (especially on the middle/right Sathanas) theres a large amount of reflection from the "sun".
Make parts of the nebula darker? it reminds me of my first renders where the nebula covered the whole of the background.
(In future) as you get better you can add ships to this to make it more interesting, as I doubt either the Faustus or the three Sathanas would be without fighter support or a couple of cruisers or something, just flesh the picture out a little.
Other than that it's a great render! well done.
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