Because there is so much to look at, and the challenge is just shadow, I think this would have looked better if just concentrating on a smaller area of the picture
Don't really see shadows so much as unlit areas here (I'm sure there's a difference). Also, the image seems to be skewed a touch to the left and there's an annoying bright artefact at the bottom you should have cropped out.
I love double-vaulted church ceilings. Nice image. A bit over sharpened and contrasty for me. The right lighting is overblown and draws the ey there, rather than to the shadows above.