I would roughly like the measurements to be around 10 cm in length and 8 cm in width and the placement on my ribcage (undecided about which side yet). Style-wise I imagine it to resemble pretty much exactly as depicted in the example pictures. It doesn´t have to be 100% accurate to a real lavender branch but I do imagine it quite detailed. Regarding structure, I really like the second example photo I gave with it being quite delicate as I feel that best matches me personally and meets my aesthetic preferences. I also personally prefer fine-line work because it best matches my physical appearance and body type.
The meaning behind it is that I love flowers and find them absolutely beautiful. Lavender especially is not only visually appealing to me, but I also associate very fond memories with the plant, like my aunt who is a florist or trips to France with lavender fields in full bloom. The scent is immensely comforting and soothing for me which is another reason why i would like to permanently carry that as a little reminder around with me wherever I go. I furthermore really admire your artwork, which is why I entrust you to do my first tattoo!