Cactus and Canvas

I I'm about to try flat canvas boards. The 3-D version is beginning to present a storage dilemma. 

There is unexpected beauty in cacti with all the contrasting shades and textures. 

I'm in love with these cactus images, hoping to paint and capture all those subtle shades of green.  The textures on a cacuse present a challenge, too. Spikey quils, silken blossoms, and green fleshy leaves present a symphony of contrast.