Here are my thoughts on your photos...
The butterfly (a painted lady, I think) is very nice. The repetition of the out of focus flower in the background is nice. You might consider cropping some off the bottom of the image (maybe using a 4:5 ration) as the dead space does not add anything to the story.
The out of focus stalk in the mushroom photo is very distracting. Consider cropping this image down from the top to eliminate all of the white part of the stalk and maybe even most of the reddish part as well.
The photo of the flower doesn't do much for me. The composition is very centered so you might try cropping to put the blossom off center. Also pay careful attention to the edges of the the frame. There is a brown stalk on the lower right that is merged with the edge of the frame... very distracting.
--- Frank ( http://www.gorga.org/blog )