Well, my prologue doesn't really have any dryads in it, but after you said that, I actually got a pretty good idea of a second part of the prologue

Commenting kinda late on a bunch of previous comments
I don't think nymphs are just water dwellers actually, I think a nymph is any kind of nature spirit, tree nymphs included.
Also, Im not entirely sure about this, but I think that although they can leave their tree, if they go too far from it they will die. A radius of a couple miles or something like that.
Appearance-wise, you have pretty much free reign, but in mythology I've noticed they usually bear some resemblance to their tree. (Willows will be tall and graceful, birches will be pale and slender, etc.)
Again, it's your choice whether you want to use that or not.

Yeah, but you wont find anything anywhere on a tree nymph. Why? Because they're called Dryads.

Yeah, I tried searching tree nymph before I stated this conversation, and couldn't find anything.

Bacon, please stop trying to be an utmost silly goose. It is very annoying and silly goose.

OP, Wood Nymphs are common to forests where travelers come through. The travelers are seduced by the Nymphs and they lead the travelers away so that the Nymphs can use them in whatever way they want. The only thing really being. . . .lovemaking.

Bacon's right; using the term 'tree nymph' for searching for info is gonna be pretty hard.

I think some of what has been posted up here is kinda...without real mythological basis. Non-gendered with no eyes? Nymphs, dryads, naiads, etc. are exclusively female in the original mythologies connected with land forms, trees, and so on depending on the type.
http://en.wikipedia.org/wiki/Nymph

Oh, and if you can find pictures that are used in the D&D MM(s), they're good for ... inspirtion?

did u mean inspersion

No, I meant inspiration ;_;