Very nice set. In picture 1 you really need a crop so the insect becomes a true subject. As it stands now, it's hardly visible, as IO missed it when I 1st looked at your picture.
Tend to over crop is a general observation, and is subjective nearly all the time. In the case of the flower/insect, they should equally share "center" stage. Actually, the insect should get top billing as it's a harder subject to deal with.
Not the best, but you get the general idea. Too much dead space doesn't add to one's image, just makes it all that much harder to appreciate your composition.
Pic #2 could have been composed somewhat better if you didn't have those bloooms dead center. Pic 3 & 4 by their very nature have a strong composition as is.