First of all I added contrast and saturation, than I played with light and shadow. I added a further contrast for the boundaries and a contrast mask to increase in sharpness. At the end I put a black frame that is an essential thing for this kind of photo, in my opinion.
I think that the image has more effect in this way.
I wait for your opinion and...I really hope you don't mind also because I make workshops only if the photo like me very much!
Regards
Elena