I'm commenting on the the pics, as I would of my own.
#1 woof, doesn't tell much. For me I would try to capture the image
from the woofer's perspective or height. Probably a glimpse of their
reaction or maybe at their height.
#2 Well just ask yourself what're you trying to achieve here? Do you
want to portray the crispness of the petals, beauty of the rose, etc.
For me I'd choose a different angle, perhaps top down, or downright straight, or something! get the creativity cracking! Sprinkle some water to the petals adds appeal. Nothing wrong with your macro and lens though.
#3 I love shots like these! However take note of the off focused flower on the right. Kills the photo. I'd choose a different angle too though, maybe lower or higher and include some of the background by turning up your settings.
#4 lacks sharpness and beauty.