The unit looks amazing. Choice of colours might be a matter of taste, but I think for a elite unit the royal purple is an excellent one. Contrast and depths of the miniatures is also outstanding.The wonderful shield designs (decals or painted by hand?) add the special something and I also like your super thin Sarissai.
You could make me very happy if you would paint some War Elephants in this scale.

I hope they are next on the army list.