they all sound a bit similar and "depressing" ..why not just make short loops (with 3-4 variations for each one of the factions? )
variation 1_some main theme ,trying to capture each faction's "feel" maybe
elves- dreamy like,with harps and stuff (maybe hang drums or metalophone? )(like the one you tried ,but a bit more trippy and nostalgic.."lets say enya or mckennit "not depressing..)
dwarves- folk (maybe ambient like..with anvils and hammer hits ,kinna like the classic soundtrack from conan the barbarian .. or something with horns and taiko drums or marching sound in the backround)..a "militant"-pompous style but "heroic" while orcs' should be same styled but "dark-mean"
orcs and mordor - dark ambient with "heavy breaths,fire and chains sounds" some heavy-profound drum line here too..or a marching sound in the backround
men - folk (flutes ,medieval pub music..a bit more pompous for warrior factions like gondor-rohan and a bit more cheerful..with happy violins for eriador -dale) ro maybe just classical guitar arpeggios
that's how i imagine them..i'm not experience at all with sound editing but i was trying to cut into loops some of blind guardians intro's (like the bard song ,or the lord of the rings, the quest for tanelorn,mordred's song,a past and future secret etc..why not use-edit-process some existing material too if you're familiar with sound-editing programs ?)
evil men (some kind of eastern music..maybe a "tribal" base with udu percussions and or some sitar cords or some "eastern" sounding flutes..or why not didgeridoo too)
try to give every faction it's "own" tribal-ethnic-ambient like sound some videos for sampling-ideas..
perfect samples for gondor..or the next one's intro (no vocals) for eriador
maybe this one's intro for isengard-mordor (generally orcs') samples
or this one for orcs (?)
for rhun or harad (?)
something like this for dwarves
or something like these for elves
rhun-harad samples (?)
other generic sources (look for the instrumental parts,intros or if you're up to it eliminate vocals and listen to the melodies..)
just some ideas for how possible samples should maybe sound like..if you find some for every faction,edit-process them (maybe pitch and/or velocity) and implement some effects or ambient sounds maybe you could give em a really "original" sound (for each one of them)..ok the "conan" and "ask the mountains" ones are really recognizable but the others could maybe do the trick (at least to some extent)..maybe you could also use the lotr trilogy soundtrack .. (as long as you use short edited parts for sampling-looping i don't think there should be any "copyright infrigement" issue..and it's anyway for non-profit use,so why not ? )