Well I don't know much about photography but I can give you my impression.
It really is a great picture. Although it is black and white I imagine to see the original colours. Due to the black background the white light gives the picture additional contrast. The structur and form of the leaves is very clear.
I like how the main focus is on the middle of the plant and the leaves in the front and the background becomes blurred.
Though I would like to see more of the plant. The amount of background and plant seems to be a bit unbalanced in my eyes. Perhaps the plant could be more in the center of the picture or the whole picture could be cropped to a square.