Some nice shots.
Some contrast would definitely help, as would a flash diffuser of some kind. I've got a Sto Fen Omni Bounce and a Lumiquest Pocket Bounce. Both are OK, but I've got a Lumiquest Ultra Soft on order and I have lots of hope for it for shooting butterflies. All of these are for external flash - I don't know if you have an external. If not, cut out a piece of translucent plastic, like from a milk jug, and fix it to the front of the lens:
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The Pro 1 has ETTL so the camera should make up for the loss of light. Diffusers will help a lot.
Some of your butterflies, like the Morpho for instance, look a *touch* out of focus. Try a bit more aperture to get more Depth of Field. Set the camera to manual, aperture f/8, and then play with shutter speed until the pictures come out OK. It will take some practice shots.
Other than that they could use some sharpening. But you're on a great start because these are very good.