The systems are good and i generally like the map.
But the terrain isnt anything like the real avatar..
it needs a massive increase in doodads(you can use the jassnewgen expansion on the world editor so you can have unlimited doodads).
You should use custom doodads, such as long grass and different trees.
You should also change the tint of the trees etc.
+ add a better fog
I like alot of the skins, but some of them could be edited more to make them more bluey like avatars
Glad you appreciate the systems

they take alot of time and testing to make.
For terrain, it is constantly being improved. I'm alrdy using JNGP but i don't want too many doodads anyways, because it makes the editor slower and that is not compatible with my poor comp >.<.
There are alrdy custom doodads, like conic and puffball trees, but i'll definitely add more.
+What's wrong with the current fog :O?
Skins: I have to draw them myself since noone else does :O this is how i got the skin for Na'vi huntrees/Neytiri. I'll draw more, but it takes much time so i ain't in a hurry to do that.
I've got a small idea.
What about "Tribe's Meeting Lodge" (or whatever) building for Avatars that provides upgrades for your units, but to get them you have to have enough human/na'vi/nature/something else understanding points. Like to increase na'vi hp and damage, you have to know about na'vi themselves and about humans, to know how Na'vi can counter them. Or shall we say knowledge of nature can increast hp regeneration rate of na'vi. Every higher level research would require you to know more than previous.
na'vi could aslo praise eywa or something like that... some kind of ritual or something that would give Eywa some mana...
Talking about Eywa, there are some more suggestion:
-"Fly swarm" swarm of mosquitos attack all the infantry in AoE, forcing them to drop weapons and flee. Of course people have defencive suits, but the whole swarm of deadly bugs can still be terrifying you know.
-"Shower of hail" attacks all the corps in the area, slowong them down and damaging a bit. Vehicles get no damage but move in slower. Hmmm, kinda lots of abilities for Eywa... but oh well, it's kinda intresting this way too...
-"Spiritual link" buffs na'vi unit or an Avatar. 'nuff said.
-"Gas cloud" creates a cloud of organic gases in target area that explode after some time or if someone passes trough them.
-"Heavy rain" works in AoE (again), slowing all the corps (Vehicles may get completely stuck in dirt) and healing Na'vi.
-"Fog". Hides Na'vi and animals in a fog for some time.
-"Increased growth". Allows your trees to regrow faster. Or at least a one tree. can also heal home tree.
I was thinking of something like that

and the whole Understanding of <bla> concept will get a major improvement in terms of intuitiveness soon, be sure to check that out.
I approve the "Praise Eywa" thingy too

I'll add that.
About Eywa spell suggestions, i like most of these ideas, actually so much that some of them are already ingame

like:
-Spiritual Link, is already Blessing (pandoran spellbook);
-Gas Cloud sounds very similar to Green Martyr (flora spellbook), but then again, i was thinking of a corpses version;
-Heavy Rain is The Rain

(weather spellbook)
and you can heal trees with Green Peace.
However, i like Fly Swarm and Fog, things liek that were already planned for implementation

. For the regrow faster spell, the way regrowth is coded won't allow that alas.
Keep the ideas coming!
Finally an update. Let's get this thing tested!
Avatars:
* Weird issue with the Quest Giver: before you talk to the Na'vi, the Animal quest icon is a big green square, but goes back to normal once you talk to them.
* The Avatar lacks a portrait.
* The (very, very) long cooldown on Discover is very grating, could you move it to the front and levelable (just like Interact)?
* Using a spear on a neutral animal doesn't make it aggressive.
* The Medkit's tooltip says you can use it to heal others, rather than instantly healing your avatar.
RDA:
* The ISV has two requst delivery buttons during the intro, one disappears later.
* I can't find Snipers, are they a foot unit or a mech?
That's all for now.
As usual, nothing can escape ur eye

though i wouldn't mind if you'd tell what things you like more often aswell ^^
Avatars:
*Yup i just noticed that too, icon will be fixed.
*I already notified Misha about this portrait

.
*Discover is like that now because it should force the player to choose between bonuses (or at least, their global flavour).
An Avatar will no longer be supposed to be able to get them all in the same game. Part of the customization, cuz atm, all Avatars look pretty much the same endgame if it lasts long, with everything unlocked in all domains.
*Right, i'll fix aggro trigger.
RDA:
*Yea the first one is the "intro version", which can be used on flat ground. That's why it disappears. Does it look weird :O?
*Snipers are not yet implemented. Sometimes Banefull and i don't work on the same fields in a given version, and it can give such results :x.
EDIT: 0.32 is out, with a new spell for Eywa, and fixes for some of the above bugs.