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The elven city is very beautiful. The units seem appropriate, except I would replace the dragon with something else (like a Forest Spirit or some other quirky creature) - they're all in the forest, and the dragon is out of place:D. And the druids are strange; the ones depicted should have been called shamans. We saw a real druid in the first and second games; well, almost real, because ideally, he should have a white robe, a long beard, and a scythe (by the way, it would be cool if he fought in melee with a scythe - grabbing the enemy by the hair and slashing their throat with the scythe:D). The upgraded archer somehow looks worse than the un-upgraded one:(. The dancers are all very anime-like, but that's not so bad for elves; the problem is that they die like flies. The unicorn is cool, and its stats are good; its ability to reflect magic is especially awesome. The fairies are strange - the un-upgraded ones are okay, but the upgraded ones are either some kind of symbiosis between a human and a plant, or just a zombie-fairy:D. The Ent is power. Beautiful power. And, what's really great, it's a fast-moving power - and that's at least reasonable: large creatures should run farther than small ones - if only because of the size of their legs. But the Ent is also just cheating, because it has the best stats for a level 6 unit; and if you also consider that rangers mainly upgrade defense, then an entrenched, upgraded Ent is virtually invulnerable.
And separately - A HUGE THANK YOU to the developers for almost removing female warriors from the elves. I'm not a misogynist; I just like common sense. WOMEN DIDN'T FIGHT IN THE MIDDLE AGES (except for Joan of Arc, some Japanese female samurai from the Tale of the Heike, one Indian Rani who fought against the English, the wife of a chieftain of some British tribe who fought against the Romans, and one Viking woman who drove away Native Americans in North America; I haven't heard of any other female warriors), and they didn't fight in Tolkien's works (although they cast spells - consider Maia Melian, who kept her kingdom with Thingol under magical protection, or her daughter Lúthien, who, together with Beren, defeated Morgoth (although not banished him:D)). This is a good start, and this trend - the gradual removal of female warriors from games - should be supported. The same thing is happening in Gothic, and I really like it