I like it - great experiment. A nice, sharp and simple image. If you have other backgrounds, it would be an interesting experiment, if only for your own information, to try it on other coloured backgrounds.
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WesternGuy
^I agree with this. I like the image as it is, and like PinkDoor, I could see it printed and hanging on the wall. At first, I thought the yellow background was too much, too overpowering, but actually it's the overpowering yellow AND orange that really make this different and interesting, I think.
Still, it might be interesting to see what a different background would do to change the overall atmosphere of the photo. Perhaps even a "series" of the same photo with different colored backgrounds?
EDIT: I just figured out why it's strangely attractive to me with those bright colors. It makes me think of a Georgia O'Keefe painting!