Yes, I think you succeeded;
- especially against a dark background, metering for correct exposure is what often catches folks out, but not you
- when I read it was only a two shot stack (at f/5.6) I was concerned about DoF, as you say, they are a tricky subject - being quite deep and with perhaps less obvious areas to focus upon definitively, however you have again produced a satisfying image
The other 'problem' with Orchids is that their multitude of blooms in (inseparable) close proximity often leads to awkward compositional challenges - unless the clone tool is used to remove large bright things at the edge of frame - the problem then is that often we'll 'miss' them, instinctively knowing that there should be more in the frame, unless what remains is a great composition - and often it isn't because nature doesn't always help us.
All that said, I think your decision to include three here outweighs the possible removel of the one lower right, leaving just two looking 'lonely'.
Waffle-y Dave