Would like your opinions on some pics I took?

Hi everyone,
So I have been taking a lot of flower pics lately and would like some feedback on them. I will mark which ones were taken on the cell or with the Nikon. Please don't be harsh, but constructive criticism is welcome. I think my composition has improved over the last couple of years and I hope you like them.

https://kittyscott.shutterfly.com/21948 Grape Hyancith--nikon
https://kittyscott.shutterfly.com/21747#21746 spider plant blossom--nikon
https://kittyscott.shutterfly.com/21651 Rodendendum (sp)--nikon
https://kittyscott.shutterfly.com/21533 Andromeda--cell
https://kittyscott.shutterfly.com/21533#21519 open tulip-cell
https://kittyscott.shutterfly.com/21533#21518 pink dogwood--cell

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