Mark, I like this one with the nice sharp front flowers and the soft roll-off of DOF. I think by the looks of some of the pixalation on the BG you are getting that you can save these in a larger file.......200-250kb may smooth things out more for you. I don't imagine noise is the culprit at ISO 100.
Great image, works for me but everyone likes different DOF on flowers
Mark, now your messing with my mind and making me dizzy I could be wrong but I do believe the last may be a bit upsidedown
Tip for you that you may tinker with...........try desaturating the reds only, that should bring you more petal detail. At first you may miss the zip of the color but they willl begin to look more natural to you IMO The orange could benefit from the de-sat too to gain detail.
The middle shot above has nice sharpness and petal veigning showing, that is a very good shot!
but I do believe the last may be a bit upsidedown