I thought this was a watermelon at first =) The reds and greens contrast beautifully, and the brown adds an accent. You might want to crop out the greyish rock on the right, as it "intrudes" in the flowers and leaves. I do like the white bud in the center. Nice shot!
I love caladium leaves, but never noticed the blooms before. I also like how the white blooms pick up the white color of the wall or house. Very pretty shot!
Great color, though I have to agree about the shadow. It would have been better if it was taken either in full sun light or totally shaded. Either way I can see why you took this picture. The colors are fantastic.