I agree, nice composition with some good balance of dark and light in the photo but needs to be brightened up and contrast adjusted. I learned to go for a 'black' black and a 'white' white somewhere in the image. I see light gray and charcoal gray but not white or black.
Also think about framing shots, do you want more of that flower at the top or having it cut off where it is? Think about where you want a photo to 'end', how much of a subject should be in the frame (and what should stay out of the frame).