I captured this close-up of a butterfly ready to probe for its nectar reward using a Nikon Z9/Nikkor Z 100-400mm @400mm. The Nikkor Z 100-400mm is a stunningly sharp, universal telephoto zoom lens for many situations where you cannot physically get closer to the subject, which also features macro style capabilities. The added working distance when shooting from 300mm to 400mm, is a huge benefit for flighty butterflies. This image would not have been possible without the Nikkor Z 100-400mm.
Randy Ziegler Blog 
I have read there are somewhere in the region of 20,000 species of beautiful butterflies worldwide. You captured the personality of this one with great technical knowledge and skill! Indeed, lovely.
Appreciated the information about butterflies and your positive comments!