Lovely idea here Gururaja. I too feel that the monochrome is a nice choice for this image. The undulating patterns on the cactus' surface look like the sand dunes of a desert indeed !
Might just crop a few pixels on left to 'simplify' the image by removing excessive elements in the frame. Will add my experiment in the illustration forum & update this message...
EDIT/UPDATE: Have added an experimental re-crop image
here in the illustration forum.