Dan, nice capture! 2 butterflies at once on the same plant is fortunate! I have to agree with Paolo, the light background is distracting and the levels on the butterlies need a good contrast boost. I think also a closer crop around the butterflies would result in better shot.
Painted ladies are nice, but a bit underexposed; and why don't you try to use a more "natural" background (like the sky, trees, or something like that: a wall or a window draw the attention away from the subject)?