Wow! I love these photos! You could really get a nice series going here, with tons of different subjects, as well as different levels of simplicity (i.e. nothing on the ground, as in these photos; some hay or small flowers scattered on the ground, etc.)
I notice in your first sunflower picture, there are two tiny dots on the leaves (left/center) – I think if you edit those out, it will add another level of perfect-ness to the photo. 🙂
There’s a glare on the pumpkin – it would be nice if you could figure out a way to eliminate that.
Again, really nice!! 🙂