Nice.
Flowers are inherently beautiful subjects, of course, so you can't really go very wrong with flower photos. And they don't pull faces, don't run away or move during the take...
For the first I'd personally wish for a tad of warmer colour temperature, as they were in the shadow and the colour temp is therefore quite much on the blue side.
I think if you ran the last through an "auto contrast" action, it'd turn out a bit brighter and thus more brilliant colourwise. Good focus.
Thank you for your critiques. You mentioned in my "woodpecker" post to separate the photos, I haven't figured out how to do that yet. I'll work on it. In these flower pictures, they were the first 3 shots with my new Sigma 17-70 lens. There was nothing done to them except sizing. I just wanted to show how sharp this lens is.