Well I have to admit that this art in particular just brought back so many memories when I used to play Starcraft 1, and so far it's a simple piece of art that clash together all what prottoss are about; Discipline, power and Wrath!
However I have to say that you forgot to add something really important that is the High templar, cuz their fusions forms the archon (the blue one) and the Dark Templar in the image forms the Dark Archon (the Red one).
But overall it is just majestic the way the dark templar clashes into the image. The colors are stunning by themselves but I really think that The archons (both) need a little retouch cuz they need more detail in my opinion. And there's some lines in the Blue archon as well that looks from the original sketch.
BUt so far I'll give it a solid 9/10.. I really like it. And I think I'm gonna play SCII soon Hehe.
Thank you! I Appreciate this feedback! Thank you especially for your mention of the High Templar and what they form, due to my certain lack of knowledge of this game's mythos in varying areas I for the longest time was a tad confused towards the blue archons. And quite so about that lining you mentioned, that Is from the original sketch actually, and I've been meaning forever to clean that up, it's time though that's always my nemesis lol.