The only thing I would mention at this point would about the soft brown brush strokes in the middle of the flower peddles. From the render you posted, the flowers look fine other than I find those darks markings to be a distraction.
Still having some difficulty with the leaf-planes/mesh, probably a bad ref box for normal thief..still learning.. And still some room left for some random flowers/plants. Still planning on redoing some things and make em look better! Must.make.look.better. Thanks for taking a look!