Now I have all my plants together I get to sit, look at them and compare. I am noticing that the textures can vary quite a bit. One of my clones , a Mike Brooks' seedling has domed windows which gives the plant a warty reptilian appearance. I've checked with the friend whom I received it from and he says not one of the ones he retained has this. ( One of the benefits of growing from seed ).
Here's some photos of four of the clones I have.