Opps...I'm in the minority. I think the butterfly needs to be moved more towards the center of the block (above the right flower bud). The way it appears to me the block is not "balanced" and the butterfly should be moved. Just my 2 cents...
I really like your pattern and choice of fabrics!
If you are questioning the position of the butterfly, you are not happy with it. Go with your gut feeling...it is usually correct.