Seriously, I love this kind of stuff--especially rendered in your style. The hair is gorgeous. The pose is great. The littlest detail in the patterns are lovely. The background is enchanting. The colors--god, the colors--are a treat... And I want those shoes.
I just read what you said about this picture on tumblr, and I wanted to tell you that you should definitely not be so harsh on yourself!!! I don't know what it is you were aiming for in painting this, but the result is beautiful! Even if it's not what you imagined it would be, you still created a gorgeous piece of art.
Seriously, this is a great painting you've got here. The colors look fantastic, the girl's face is so delicate and adorable, and the piece has so much atmosphere, it feels like it should be a part of a larger story. I like all of your other art (that's why I watch you!), but I especially like this piece because you're using your style of drawing beautiful women in a setting much greater than what you're used to. This piece is much different than what you usually create, and that's awesome.
You've probably been working on it for too long and you're sick of it, but you definitely have not failed. I love this piece, and I hope you're able to make more like it (and better!) in the years to come.
oh wow that's so beautiful! I am in a complete admiration! I love how you've made the colours scheme, how soft and nice they are! And the skirt, so fantastic! And the forest around, oh, that is AN AMAZING ARTWORK!