As the others have said, the background has too much going on and is too bright. To make it worse, your sprite is not very bright or noticeable. I had to search for a second to find him when I first saw the image. Your background is overpowering the foreground.
I would try losing the middle layer of trees, and toning down the colors in the front layer of trees.
The individual works themselves are actually quite good, it's just that there's too many of them, and your color choices could use improvement.
That goes for your text as well, as ptoing said.
I don't actually like the font itself, but you have a problem with the background color of your message box. I also think you would be better to use text with a drop shadow, rather than a full border.
Good work, though. I'm especially impressed with the portrait of the bald, monocle'd man. I'd like to see an improved version.
