This is a very good macro photograph, the cropping of the photograph is good as it shows the main subjects clearly without any other distractions in the frame.
The composition of the butterfly and the flower is very nice with the butterfly appearing in one third of the photograph and the plant appearing in another third of the frame.
The focusing is very nice as it has both subjects in focus.
The eyes and wings of the butterfly are the point of focus which draw us into the photograph more.
The depth of field is very nice as it allows us to focus more into the photograph.