Over all it is a nicely done bit of work but there are a couple of things I would touch up if I were you.
1) highlight lines need to be cleaned up as they are very shaky, as you pointed out. All you really need to do to clean these up is go over the inside of them with black to even them out a bit.
2) Metallic areas need highlighting as they appear very flat right now. Give the edges a few highlights and you will be good to go.
one thing I want is the ability to split my fire everywhere, it makes no sense that a squad of 10 guard or marines or whatever all have to fire at 1 target with everything, is the guy with the lascannon not smart enough to realize maybe he would be better off firing at the massive tank looming overhead instead of the little man no bigger than a squat running at him, or is that far too complex for the 10yr olds?
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