I don't think it is just one of the other colours, it is all of them. ONLY because the girl/fairy that you want to be the centre focus of your block is overwhelmed by the colours surrounding her. That is why I think you are disappointed. The combination of the other colours is fine. They look good together, and I would not go for the all green tone. One or two suggestions from me:
1. Find a stronger subject to put in the centre of the block.
2. Choose lighter tones of the same colours if you want to keep the fairy as your focus fabric.
I like the Art Deco design of the block - reminds me of lead light panels from that era.