I wouldn't be surprised if your block is the standout in the whole batch.
As for your piecing, aside from the ironing ;-) , it looks great - all the pieces are aligning perfectly.
Just watch the 1/4" seam line. There is a tendency to wander at the beginning and the ends of the seam line (I can see your stitch holes). If I'm not concentrating, I do it also.
Love, love the butterfly.