Usually I don't mind a bit of background in a flower shot, but I have to agree with Uncle Frank on this one, only because the browns of the mulch (?) and the orange leaves at the top subtract from the power of the yellow. If you have PS, you could try removing or burning the background, or perhaps blurring it or maybe even smudging it in a circular pattern around the two flowers.
Was this taken with a macro? It's just personal preference, but I'd like to see a closer shot of the inside of the top flower.
The sharpness is great and I love your subject. Yay lillies!
That's a very nice blossom, and you portray it in rich color and with great clarity. But unless you've taken it for documentary purposes, I think the dead leaves just behind the upper part of the flower and other detritus in the frame detract from the image.
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