you are cheating yourself. you obviously can paint as i can see from the design (which has great blending) but the rest of the model is rushed looking. you need better highlights that are 1 to 2 shades lighter that the base color and use em on the sharp points of the model (edges of armor plats or end of/ top of antenne) the gems need more black in em, see the many article about gems, which also need more highlights. i know you wanna play, but like i said you have the skill, but it looks like you are rushing. if i was you i would touch up this "soon to be" awesome model
Actually the design is celtic. Its out of a book I bought at The British Museum last time I visited London.
But I do graffiti, so perhaps thats perhaps why it changed into that style =).