This has to be one of the dreariest covers I've ever seen. I guess that's supposed to be a waterfall behind her, which is nice (although not "silent"), but we are looking at her through a dirty, mossy pane of glass. Grubby.
I have nothing against poetry, although I'm more a fan of poets like Shakespeare and Frost than the stuff in this book (Amazon will let you read a few pages). I don't even mind "dark" poetry - I'm quite fond of Poe, actually.
However, with this cover, this book just screams "dull and depressing" to me. The hat she's wearing is very unattractive, for one thing, and I'm pretty sure her shirt is made out of sack-cloth. More depressing, though, is her strained expression. I can't tell what she's trying to convey. It's not exactly a mysterious expression, just ... weird. Like she's horribly constipated or something. Doesn't make me eager to read this.