First look at the Fire Nation.

[Pic taken from LastAirbenderFans.com]

And here I was thinking that all of Fire Nation is going to be Indian/Middle Eastern.

[Maybe these are the stunt guys.]

Anyway, the costumes look pretty okay to me, plus I see some fake background ice blocks there, so they may just be on Water Tribe ground. I hope they'll do more post-production work on the ice, since the whole scene would just look ridiculous if the sky looks more realistic than everything else.