Nice set of butterfly shots with some excellent exposures. Butterflies can be difficult in more ways than simply being gadabouts. The bright colours can be over exposed in an attempt to capture detail on dark anatomy, or when the colours are perfect then the dark parts are featureless. Your lens handles this dilemma well. I guess f6.3 gives you a good DOF. You have an admirable dedication to the pursuit and you clearly understand the principle of result through persistence.