I know this thread is titled SHOW your tats, but I'd really, really like to get this done!
Across my back/shoulder blades? Any thoughts? Would it be a pain (obv. me included) for the artist to do all the branches/flowers etc?
That is a lot of line work. Depends how good your tattoo artist is and how high your pain threshold is. A competent artist will find that really easy to do.
They stain the design onto your body and then just trace the lines. Not too hard.