If I may stick my nose in here, but it is purely a personal view and you may well choose to totally disregard it, and if so good for you.
I have been following the comments so far with interest, but no-one has yet mentioned what I see as the real problem with your picture - it is green.
Normally with colour photography we use colour to provide the contrast and to define the form of the image, so many successful colour works are fairly low in contrast and often quite flatly lit, but the colour palette is carefully chosen to provide the eye with information about form and visual dynamics.
What you have done here is to choose a subject which, by its very nature, is defined by luminance, not colour. In fact there is effectively only one colour, green, which is not terribly interesting. The compelling part of the picture is the way light is defining form, detail, and depth. So what you have really done is to take an excellent B/W picture, but render it in colour which does it no favours.
I have tried a simple B/W conversion here at home and it looked pretty good. Just my thoughts.