Too much textual contrast. Your by Robin Andblom definitely clashes a bit with everything else, while the Demo is completely different from the feel of the Tree Soul Kingdom. (also the by etc. line is made of a font that aligns itself directly to the left, while the Tree above it has the stylization that makes the center of its text a bit to the right, making the by robin etc. line seem off focus/edged to the left.) The Tree Soul kingdom is ALMOST hard to read, but not that bad. However, it needs additional shadow effects, and the image in the background clashes a bit - some spots are dark and lighter, which is a bit more noticeable with the white text and design style of the font.
The background image itself is actually very pleasing otherwise.