First of all, if you are new, you should post an introduction in the subforum dedicated to new players introductions.
now that we have that out of the way...
The first thing I noticed was how the colours all blended into one another. Basically this can be fixed by highlights on the blue and where the grey touches the blackish mix. second, there are many parts that could benefit from silver and gold paint, namely the ball thing on the pulse rifle and certain other detailing. I think the emblem should be painted either gold or orange, as those are the two brightest colours and will contrast sharply with the rest of the colours. if you are painting it orange, consider adding sept markings in orange too. this will make the sept sa'cea, which focuses on urban combat. Good luck!