I think these image have potential, but need some more love in post.
They have this shadowy, diffuse light in common, which is all good, but needs a bit work.
#1: I'd crop away a part of the sky and work on the tones and colors.
#2: Needs a tighter crop on the flower and maybe a little warming.
#3: I'd crop away a bit from the bottom and work on the colors.
#4: My favourite. Some local contrast, color work and maybe local slight burning on the background for threedimensionality would work better - the ridge between fore-and background should be more pronounced.
All subjectively my view only, of course.
Cheers
~Chris