The darkness of the leaves doesn’t quite seem to match the lighting on the flower. I might try to bring up shadows a bit more on them in post-processing, although I’m not sure how much you’ll be able to do that without creating too much noise. The photo also doesn’t seem like it’s quite tack sharp.
As far as the logo goes, I would tend to think that having the white oval behind the text of the logo is a bit more eye-catching than what you would want for a watermark. It draws attention away from the picture.