Ok, let's see:

KH Classical Hoplite: Only because of the dark leather armour... It looks a little weird.

Various Thorakitai: I love the Thorakitai who have chainmail(KH, Ptoly, etc.), but personally I don't particularly find the platemail of the Baktrian Thorakitai appealing. Still beautiful, though.

Eastern Kinsmen Heavy Cavalry: I suppose they aren't quite colourful enough. Compared to the bright armour of other bodyguards, these ones aren't that comparable.

Armenian & Pontic Generals: Their armour is beautiful and all, but their faces look too cartoonish...

Other than that, everything is BEAUTIFUL. Just awesome, particularly the Hetairoi Kataphraktoi. And everything else.