your two butterflies with the high scores are excellent, pink rose, orange daisy, and marigolds are very good. the dragonflies are really good too. beauty in the garden and dailily 2 could use a little more contrast. give yourself a chance. you're doing great!
A lot of your flower and butterfly type of images could benefit from a shallower depth of field, in order to isolate your subject from its background .. show me only what you WANT me to see
the majority of your pics seem a little flat in contrast - more so in the lighting than the colour and as Keith has pointed out often lack a central area of interest either due to DOF or composition issues. that, coupled with a choice of subject matter that is quite saturated would I imagine, be the reason for the majority of them receiving an average or slightly above average score. hope that is of some help.