Tested, and I must admit I'm slightly disappointed.
If we ignore the fact that the skin doesn't fit too much with Warcraft's artistic style, the parts of UI are either too dark, or too bright. Such dramatic differences, like in the scroll at the unitstats part, and inventory right next to it, cause a lot of visual defocus, which isn't good as it distracts rather than pleases the eye.
However, I must admit that I do love the detail in forms of leaves, and minimalism, but I would love to see more work on this - the scroll is too harsh, and the rest of the skin seems like it's not finished yet. Time interface and minimap are both very sweet - wish I could say same for all other parts. At the moment, I do believe it needs a little more work, mainly with textures, they're too sharp for my taste. Oh, and buttons seem a little off and they blend in with each other a little too much - some stronger shadows and crisper outlines can fix this in no time.
All in one: I am pleasantly surprised with an extremely good execution of the idea, details are lovely, but as much as I love the little parts, you seemed to neglect the larger surfaces of the skin.