Quick, easy things that will push the score up. Drill out your gun barrel. Put something on the base - even if it is only sand or flock. Paint some script on the purity seals ( just some thin dark lines will do ). If you are going to drybrush your highlights, just concentrate on the edges. By drybrushing the whole model you have made the armour look furry. Or you could take the drybrushed highlights to a lighter shade and then apply a wash over it. Your painting is very neat and crisp.
Kes