I like how the contrast lay between the foreground and the background. I like how the flowers are so vibrant against the darker sky. It's quite nice to view something that is light and dark, makes my eyes soothed Good work!
I'm not so sure about this one. There is no clear subject, nowhere for the eye to rest. The contrast with the background is good, but the flowers don't look sharp (or certainly not on the low-res version we get here).
This is very low resolution, so kind of limits me. I'm not a photographer and don't know how to suggest how to make better shots, but to me this looks fine. The balance is fine, you've carefully chosen the amont of space in the upper right. Basically, in my eyes, you're doing everything right and I have no suggestions. My only one would be that I wonder what it would look like with only a black border, and not the twin border.