Honestly, I like most of those models and I think you've made a good job so far. Plus, it looks like you're trying your best here.
The first one is nice, although removing parts of the mesh isn't quite a titanic job it looks good, and the felguard animations are probably going to fit very well for a Revenant, considering the original model moves as if its limbs were floating most of the time!
The blade could use some work, I agree on that. And there is maybe something wrong with the right shoulder too, but on the other hand, that kind of detail is too small to be visible ingame except on camera close ups, wich maps won't have, I don't think it's too important.
The cript flyer is an intresting edit too. I admit that I had to stare at it for a while, before figuring out what it was. It has one big issue as of now, wich is the head of the beast, can't really make any sense out of it, no idea where to look for the eyes or mouth, or fangs, or if it's even supposed to have any.
The rest looks alright to me, might perhaps look a bit better if it had bat-like wings, or something like your avatar, but now it's not important, the first thing you should do is make something about the head.
Can't really say anything on the phoenix, the picture is too small.
I don't understand what you were trying to do with the fourth one either, what's with the yellow head? Is it some kind of glass?
The skeleton footman is my favourite, it's really nice that you thought of details such as a broken helm, ribcage and heart, arrows piercing the armour. It all just seems to flow nicely with the texture.
I'm wondering how it looks while animated though, it seems you attached the spear to one arm, an object so big might draw too much attention from the observer if it moves too much, in wich case I'd attach it to the chest, wich moves less. It's only a guess though, I'd have to see it ingame to judge.
All in all, I hope you're going to finish them, don't be discouraged by criticism even if it's harsh: most of the guys around here just can't be arsed to type more than one sentence per post, and you'll have to guess what they were trying to say more often than not, but the majority of them mean well, bar some occasional trolling.