Yes, go with this, I think. I think the pose ideal -- you're not going to be able to duplicate that. And it's astute of you to realize the hazards of moving things around a lot and messing with the flow of light over the forms.
Final, parting thought is to keep the value of the orchids in check, so as not to approach and compete with the value of the white clothing. That will also slightly reduce the contrast between the value of the orchids and the background, which in turn will make them "less important" to the eye and reduce the pull of attention away from the mother and child and up into the corner. Shouldn't need a lot of detail, either, for the same reason. These will clearly be orchids, even without every dangly bit.
Good luck!
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