This painting was a definite challenge for me. I did this in acyrlics. I read other artist's posts about this one being harder than expected. This was true for me also. Of course with acrylic, there is not a soft blending to the clouds. This was the first wave I've tried with acrylic and that ended up decent. The front however, was a whole different story. I misplaced my crashing wave a bit so I had to make a bigger sand dune. I could not get a proper perspective on making a tiered sand dune. I watched Bob on video and looked at other paintings on this site. I could not get it to work. My husband suggested one big sand dune with vegetation. I went with it! This is a 16 X 20 canvas .