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Try to give them scorpion green eyes to make them look more alien, it will also contrast well with the blues and purples. Paint the eye black first to deepen it then give it some green over that. Also decide if you want to make the guns the same colour as the Tyranid's flesh. You can paint them like they are part of the same bio-mass or do them a contrasting colour.

Here is an online Tyranid painter that may help you.http://www.fallensunasylum.org/nids/online_painter.html